start length mapping [mapping_parameters...]

0 35258368 linear 8:48 65920
35258368 35258368 linear 8:32 65920
70516736 17694720 linear 8:16 17694976
88211456 17694720 linear 8:16 256

start length linear device offset

0 16384000 linear 8:2 41156992

0 20971520 linear /dev/hda 384

start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN

0 73728 striped 3 128 8:9 384 8:8 384 8:7 9789824

0 65536 striped 2 512 /dev/hda 0 /dev/hdb 0

start length mirror log_type #logargs logarg1 ... logargN #devs device1 offset1 ... deviceN offsetN

0 52428800 mirror clustered_disk 4 253:2 1024 UUID block_on_error 3 253:3 0 253:4 0 253:5 0

# lvcreate -L 1G -n base volumeGroup
# lvcreate -L 100M --snapshot -n snap volumeGroup/base

# dmsetup table|grep volumeGroup
volumeGroup-base-real: 0 2097152 linear 8:19 384
volumeGroup-snap-cow: 0 204800 linear 8:19 2097536
volumeGroup-snap: 0 2097152 snapshot 254:11 254:12 P 16
volumeGroup-base: 0 2097152 snapshot-origin 254:11

# ls -lL /dev/mapper/volumeGroup-*
brw-------  1 root root 254, 11 29 ago 18:15 /dev/mapper/volumeGroup-base-real
brw-------  1 root root 254, 12 29 ago 18:15 /dev/mapper/volumeGroup-snap-cow
brw-------  1 root root 254, 13 29 ago 18:15 /dev/mapper/volumeGroup-snap
brw-------  1 root root 254, 10 29 ago 18:14 /dev/mapper/volumeGroup-base

start length snapshot-origin origin

start length snapshot origin COW-device P|N chunksize

0 2097152 snapshot-origin 254:11

0 2097152 snapshot 254:11 254:12 P 16

0 65536 error

0 65536 zero

A.1.7. 多路径映射目标

多路径映射目标支持多路径设备的映射。多路径 目标的格式如下：

start length  multipath  #features [feature1 ... featureN] #handlerargs [handlerarg1 ... handlerargN] #pathgroups pathgroup pathgroupargs1 ... pathgroupargsN

每个路径组都有一组 pathgroupargs 参数。

start

在虚拟设备中启动块

length

这个片段的长度

#features

多路径功能数量，后跟这些功能。如果此参数为零，则没有 feature 参数，下一个设备映射参数为 #handlerargs。目前，可以使用 multipath.conf 文件中的 features 属性 queue_if_no_path 设置支持的功能。这表示这个多路径设备当前设置为队列 I/O 操作（如果没有可用的路径）。

在以下示例中，multipath.conf 文件中的 no_path_retry 属性被设置为队列 I/O 操作，直到所有路径在一组尝试被使用路径后都被标记为失败。在这种情况下，映射显示如下，直到所有路径检查器都失败了指定数量的检查。

0 71014400 multipath 1 queue_if_no_path 0 2 1 round-robin 0 2 1 66:128 \
1000 65:64 1000 round-robin 0 2 1 8:0 1000 67:192 1000

当所有路径检查器都失败了指定数量的检查后，映射会显示如下。

0 71014400 multipath 0 0 2 1 round-robin 0 2 1 66:128 1000 65:64 1000 \
round-robin 0 2 1 8:0 1000 67:192 1000

#handlerargs

硬件处理程序参数的数量，后跟这些参数。硬件处理器指定在切换路径组或处理 I/O 错误时用于执行硬件特定操作的模块。如果将其设置为 0，则下一个参数为 #pathgroups。

#pathgroups

路径组的数量。路径组是多路径设备将负载均衡的路径集合。每个路径组都有一组 pathgroupargs 参数。

pathgroup

要尝试的下一个路径组。

pathgroupsargs

每个路径组由以下参数组成：

pathselector #selectorargs #paths #pathargs device1 ioreqs1 ... deviceN ioreqsN 

路径组中每个路径均有一组 path 参数。

pathselector

指定用于决定此路径组中用于下一 I/O 操作的算法。

#selectorargs

在多路径映射中跟随这个参数的路径选择器参数数量。目前，这个参数的值始终为 0。

#paths

这个路径组中的路径数量。

#pathargs

为此组中每个路径指定的路径参数的数目。目前，这个数字始终为 1，即 ioreqs 参数。

device

路径的块设备号，由主号和次号引用，格式为 major ：minor

ioreqs

在切换到当前组中下一个路径前，要路由到此路径的 I/O 请求数量。

图 A.1 “多路径映射目标” 显示带有两个路径组的多路径目标格式。

图 A.1. 多路径映射目标

以下示例显示了同一多路径设备的纯故障转移目标定义。在这个目标中有四个路径组，每个路径组只有一个打开路径，以便多路径设备一次只使用一个路径。

0 71014400 multipath 0 0 4 1 round-robin 0 1 1 66:112 1000 \
round-robin 0 1 1 67:176 1000 round-robin 0 1 1 68:240 1000 \
round-robin 0 1 1 65:48 1000

以下示例显示了同一多路径设备的完整分散（多线程）目标定义。在这个目标中只有一个路径组，其中包括所有路径。在这个设置中，多路径会将负载均匀分发到所有路径。

0 71014400 multipath 0 0 1 1 round-robin 0 4 1 66:112 1000 \
 67:176 1000 68:240 1000 65:48 1000

有关多路径的详情，请参考 DM 多路径 手动。

start length crypt cipher key IV-offset device offset

0 2097152 crypt aes-plain 0123456789abcdef0123456789abcdef 0 /dev/hda 0

lvmconfig --file ProfileName.profile --type profilable-command section

lvmconfig --file ProfileName.profile --type profilable-metadata section

lvmconfig --type default --withcomments

# This is an example configuration file for the LVM2 system.
# It contains the default settings that would be used if there was no
# /etc/lvm/lvm.conf file.
#
# Refer to 'man lvm.conf' for further information including the file layout.
#
# Refer to 'man lvm.conf' for information about how settings configured in
# this file are combined with built-in values and command line options to
# arrive at the final values used by LVM.
#
# Refer to 'man lvmconfig' for information about displaying the built-in
# and configured values used by LVM.
#
# If a default value is set in this file (not commented out), then a
# new version of LVM using this file will continue using that value,
# even if the new version of LVM changes the built-in default value.
#
# To put this file in a different directory and override /etc/lvm set
# the environment variable LVM_SYSTEM_DIR before running the tools.
#
# N.B. Take care that each setting only appears once if uncommenting
# example settings in this file.


# Configuration section config.
# How LVM configuration settings are handled.
config {

	# Configuration option config/checks.
	# If enabled, any LVM configuration mismatch is reported.
	# This implies checking that the configuration key is understood by
	# LVM and that the value of the key is the proper type. If disabled,
	# any configuration mismatch is ignored and the default value is used
	# without any warning (a message about the configuration key not being
	# found is issued in verbose mode only).
	checks = 1

	# Configuration option config/abort_on_errors.
	# Abort the LVM process if a configuration mismatch is found.
	abort_on_errors = 0

	# Configuration option config/profile_dir.
	# Directory where LVM looks for configuration profiles.
	profile_dir = "/etc/lvm/profile"
}

# Configuration section devices.
# How LVM uses block devices.
devices {

	# Configuration option devices/dir.
	# Directory in which to create volume group device nodes.
	# Commands also accept this as a prefix on volume group names.
	# This configuration option is advanced.
	dir = "/dev"

	# Configuration option devices/scan.
	# Directories containing device nodes to use with LVM.
	# This configuration option is advanced.
	scan = [ "/dev" ]

	# Configuration option devices/obtain_device_list_from_udev.
	# Obtain the list of available devices from udev.
	# This avoids opening or using any inapplicable non-block devices or
	# subdirectories found in the udev directory. Any device node or
	# symlink not managed by udev in the udev directory is ignored. This
	# setting applies only to the udev-managed device directory; other
	# directories will be scanned fully. LVM needs to be compiled with
	# udev support for this setting to apply.
	obtain_device_list_from_udev = 1

	# Configuration option devices/external_device_info_source.
	# Select an external device information source.
	# Some information may already be available in the system and LVM can
	# use this information to determine the exact type or use of devices it
	# processes. Using an existing external device information source can
	# speed up device processing as LVM does not need to run its own native
	# routines to acquire this information. For example, this information
	# is used to drive LVM filtering like MD component detection, multipath
	# component detection, partition detection and others.
	# 
	# Accepted values:
	#   none
	#     No external device information source is used.
	#   udev
	#     Reuse existing udev database records. Applicable only if LVM is
	#     compiled with udev support.
	# 
	external_device_info_source = "none"

	# Configuration option devices/preferred_names.
	# Select which path name to display for a block device.
	# If multiple path names exist for a block device, and LVM needs to
	# display a name for the device, the path names are matched against
	# each item in this list of regular expressions. The first match is
	# used. Try to avoid using undescriptive /dev/dm-N names, if present.
	# If no preferred name matches, or if preferred_names are not defined,
	# the following built-in preferences are applied in order until one
	# produces a preferred name:
	# Prefer names with path prefixes in the order of:
	# /dev/mapper, /dev/disk, /dev/dm-*, /dev/block.
	# Prefer the name with the least number of slashes.
	# Prefer a name that is a symlink.
	# Prefer the path with least value in lexicographical order.
	# 
	# Example
	# preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
	# 
	preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]

	# Configuration option devices/filter.
	# Limit the block devices that are used by LVM commands.
	# This is a list of regular expressions used to accept or reject block
	# device path names. Each regex is delimited by a vertical bar '|'
	# (or any character) and is preceded by 'a' to accept the path, or
	# by 'r' to reject the path. The first regex in the list to match the
	# path is used, producing the 'a' or 'r' result for the device.
	# When multiple path names exist for a block device, if any path name
	# matches an 'a' pattern before an 'r' pattern, then the device is
	# accepted. If all the path names match an 'r' pattern first, then the
	# device is rejected. Unmatching path names do not affect the accept
	# or reject decision. If no path names for a device match a pattern,
	# then the device is accepted. Be careful mixing 'a' and 'r' patterns,
	# as the combination might produce unexpected results (test changes.)
	# Run vgscan after changing the filter to regenerate the cache.
	# See the use_lvmetad comment for a special case regarding filters.
	# 
	# Example
	# Accept every block device:
	# filter = [ "a|.*/|" ]
	# Reject the cdrom drive:
	# filter = [ "r|/dev/cdrom|" ]
	# Work with just loopback devices, e.g. for testing:
	# filter = [ "a|loop|", "r|.*|" ]
	# Accept all loop devices and ide drives except hdc:
	# filter = [ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]
	# Use anchors to be very specific:
	# filter = [ "a|^/dev/hda8$|", "r|.*/|" ]
	# 
	# This configuration option has an automatic default value.
	# filter = [ "a|.*/|" ]

	# Configuration option devices/global_filter.
	# Limit the block devices that are used by LVM system components.
	# Because devices/filter may be overridden from the command line, it is
	# not suitable for system-wide device filtering, e.g. udev and lvmetad.
	# Use global_filter to hide devices from these LVM system components.
	# The syntax is the same as devices/filter. Devices rejected by
	# global_filter are not opened by LVM.
	# This configuration option has an automatic default value.
	# global_filter = [ "a|.*/|" ]

	# Configuration option devices/cache_dir.
	# Directory in which to store the device cache file.
	# The results of filtering are cached on disk to avoid rescanning dud
	# devices (which can take a very long time). By default this cache is
	# stored in a file named .cache. It is safe to delete this file; the
	# tools regenerate it. If obtain_device_list_from_udev is enabled, the
	# list of devices is obtained from udev and any existing .cache file
	# is removed.
	cache_dir = "/etc/lvm/cache"

	# Configuration option devices/cache_file_prefix.
	# A prefix used before the .cache file name. See devices/cache_dir.
	cache_file_prefix = ""

	# Configuration option devices/write_cache_state.
	# Enable/disable writing the cache file. See devices/cache_dir.
	write_cache_state = 1

	# Configuration option devices/types.
	# List of additional acceptable block device types.
	# These are of device type names from /proc/devices, followed by the
	# maximum number of partitions.
	# 
	# Example
	# types = [ "fd", 16 ]
	# 
	# This configuration option is advanced.
	# This configuration option does not have a default value defined.

	# Configuration option devices/sysfs_scan.
	# Restrict device scanning to block devices appearing in sysfs.
	# This is a quick way of filtering out block devices that are not
	# present on the system. sysfs must be part of the kernel and mounted.)
	sysfs_scan = 1

	# Configuration option devices/multipath_component_detection.
	# Ignore devices that are components of DM multipath devices.
	multipath_component_detection = 1

	# Configuration option devices/md_component_detection.
	# Ignore devices that are components of software RAID (md) devices.
	md_component_detection = 1

	# Configuration option devices/fw_raid_component_detection.
	# Ignore devices that are components of firmware RAID devices.
	# LVM must use an external_device_info_source other than none for this
	# detection to execute.
	fw_raid_component_detection = 0

	# Configuration option devices/md_chunk_alignment.
	# Align PV data blocks with md device's stripe-width.
	# This applies if a PV is placed directly on an md device.
	md_chunk_alignment = 1

	# Configuration option devices/default_data_alignment.
	# Default alignment of the start of a PV data area in MB.
	# If set to 0, a value of 64KiB will be used.
	# Set to 1 for 1MiB, 2 for 2MiB, etc.
	# This configuration option has an automatic default value.
	# default_data_alignment = 1

	# Configuration option devices/data_alignment_detection.
	# Detect PV data alignment based on sysfs device information.
	# The start of a PV data area will be a multiple of minimum_io_size or
	# optimal_io_size exposed in sysfs. minimum_io_size is the smallest
	# request the device can perform without incurring a read-modify-write
	# penalty, e.g. MD chunk size. optimal_io_size is the device's
	# preferred unit of receiving I/O, e.g. MD stripe width.
	# minimum_io_size is used if optimal_io_size is undefined (0).
	# If md_chunk_alignment is enabled, that detects the optimal_io_size.
	# This setting takes precedence over md_chunk_alignment.
	data_alignment_detection = 1

	# Configuration option devices/data_alignment.
	# Alignment of the start of a PV data area in KiB.
	# If a PV is placed directly on an md device and md_chunk_alignment or
	# data_alignment_detection are enabled, then this setting is ignored.
	# Otherwise, md_chunk_alignment and data_alignment_detection are
	# disabled if this is set. Set to 0 to use the default alignment or the
	# page size, if larger.
	data_alignment = 0

	# Configuration option devices/data_alignment_offset_detection.
	# Detect PV data alignment offset based on sysfs device information.
	# The start of a PV aligned data area will be shifted by the
	# alignment_offset exposed in sysfs. This offset is often 0, but may
	# be non-zero. Certain 4KiB sector drives that compensate for windows
	# partitioning will have an alignment_offset of 3584 bytes (sector 7
	# is the lowest aligned logical block, the 4KiB sectors start at
	# LBA -1, and consequently sector 63 is aligned on a 4KiB boundary).
	# pvcreate --dataalignmentoffset will skip this detection.
	data_alignment_offset_detection = 1

	# Configuration option devices/ignore_suspended_devices.
	# Ignore DM devices that have I/O suspended while scanning devices.
	# Otherwise, LVM waits for a suspended device to become accessible.
	# This should only be needed in recovery situations.
	ignore_suspended_devices = 0

	# Configuration option devices/ignore_lvm_mirrors.
	# Do not scan 'mirror' LVs to avoid possible deadlocks.
	# This avoids possible deadlocks when using the 'mirror' segment type.
	# This setting determines whether LVs using the 'mirror' segment type
	# are scanned for LVM labels. This affects the ability of mirrors to
	# be used as physical volumes. If this setting is enabled, it is
	# impossible to create VGs on top of mirror LVs, i.e. to stack VGs on
	# mirror LVs. If this setting is disabled, allowing mirror LVs to be
	# scanned, it may cause LVM processes and I/O to the mirror to become
	# blocked. This is due to the way that the mirror segment type handles
	# failures. In order for the hang to occur, an LVM command must be run
	# just after a failure and before the automatic LVM repair process
	# takes place, or there must be failures in multiple mirrors in the
	# same VG at the same time with write failures occurring moments before
	# a scan of the mirror's labels. The 'mirror' scanning problems do not
	# apply to LVM RAID types like 'raid1' which handle failures in a
	# different way, making them a better choice for VG stacking.
	ignore_lvm_mirrors = 1

	# Configuration option devices/disable_after_error_count.
	# Number of I/O errors after which a device is skipped.
	# During each LVM operation, errors received from each device are
	# counted. If the counter of a device exceeds the limit set here,
	# no further I/O is sent to that device for the remainder of the
	# operation. Setting this to 0 disables the counters altogether.
	disable_after_error_count = 0

	# Configuration option devices/require_restorefile_with_uuid.
	# Allow use of pvcreate --uuid without requiring --restorefile.
	require_restorefile_with_uuid = 1

	# Configuration option devices/pv_min_size.
	# Minimum size in KiB of block devices which can be used as PVs.
	# In a clustered environment all nodes must use the same value.
	# Any value smaller than 512KiB is ignored. The previous built-in
	# value was 512.
	pv_min_size = 2048

	# Configuration option devices/issue_discards.
	# Issue discards to PVs that are no longer used by an LV.
	# Discards are sent to an LV's underlying physical volumes when the LV
	# is no longer using the physical volumes' space, e.g. lvremove,
	# lvreduce. Discards inform the storage that a region is no longer
	# used. Storage that supports discards advertise the protocol-specific
	# way discards should be issued by the kernel (TRIM, UNMAP, or
	# WRITE SAME with UNMAP bit set). Not all storage will support or
	# benefit from discards, but SSDs and thinly provisioned LUNs
	# generally do. If enabled, discards will only be issued if both the
	# storage and kernel provide support.
	issue_discards = 0

	# Configuration option devices/allow_changes_with_duplicate_pvs.
	# Allow VG modification while a PV appears on multiple devices.
	# When a PV appears on multiple devices, LVM attempts to choose the
	# best device to use for the PV. If the devices represent the same
	# underlying storage, the choice has minimal consequence. If the
	# devices represent different underlying storage, the wrong choice
	# can result in data loss if the VG is modified. Disabling this
	# setting is the safest option because it prevents modifying a VG
	# or activating LVs in it while a PV appears on multiple devices.
	# Enabling this setting allows the VG to be used as usual even with
	# uncertain devices.
	allow_changes_with_duplicate_pvs = 0
}

# Configuration section allocation.
# How LVM selects space and applies properties to LVs.
allocation {

	# Configuration option allocation/cling_tag_list.
	# Advise LVM which PVs to use when searching for new space.
	# When searching for free space to extend an LV, the 'cling' allocation
	# policy will choose space on the same PVs as the last segment of the
	# existing LV. If there is insufficient space and a list of tags is
	# defined here, it will check whether any of them are attached to the
	# PVs concerned and then seek to match those PV tags between existing
	# extents and new extents.
	# 
	# Example
	# Use the special tag "@*" as a wildcard to match any PV tag:
	# cling_tag_list = [ "@*" ]
	# LVs are mirrored between two sites within a single VG, and
	# PVs are tagged with either @site1 or @site2 to indicate where
	# they are situated:
	# cling_tag_list = [ "@site1", "@site2" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option allocation/maximise_cling.
	# Use a previous allocation algorithm.
	# Changes made in version 2.02.85 extended the reach of the 'cling'
	# policies to detect more situations where data can be grouped onto
	# the same disks. This setting can be used to disable the changes
	# and revert to the previous algorithm.
	maximise_cling = 1

	# Configuration option allocation/use_blkid_wiping.
	# Use blkid to detect existing signatures on new PVs and LVs.
	# The blkid library can detect more signatures than the native LVM
	# detection code, but may take longer. LVM needs to be compiled with
	# blkid wiping support for this setting to apply. LVM native detection
	# code is currently able to recognize: MD device signatures,
	# swap signature, and LUKS signatures. To see the list of signatures
	# recognized by blkid, check the output of the 'blkid -k' command.
	use_blkid_wiping = 1

	# Configuration option allocation/wipe_signatures_when_zeroing_new_lvs.
	# Look for and erase any signatures while zeroing a new LV.
	# The --wipesignatures option overrides this setting.
	# Zeroing is controlled by the -Z/--zero option, and if not specified,
	# zeroing is used by default if possible. Zeroing simply overwrites the
	# first 4KiB of a new LV with zeroes and does no signature detection or
	# wiping. Signature wiping goes beyond zeroing and detects exact types
	# and positions of signatures within the whole LV. It provides a
	# cleaner LV after creation as all known signatures are wiped. The LV
	# is not claimed incorrectly by other tools because of old signatures
	# from previous use. The number of signatures that LVM can detect
	# depends on the detection code that is selected (see
	# use_blkid_wiping.) Wiping each detected signature must be confirmed.
	# When this setting is disabled, signatures on new LVs are not detected
	# or erased unless the --wipesignatures option is used directly.
	wipe_signatures_when_zeroing_new_lvs = 1

	# Configuration option allocation/mirror_logs_require_separate_pvs.
	# Mirror logs and images will always use different PVs.
	# The default setting changed in version 2.02.85.
	mirror_logs_require_separate_pvs = 0

	# Configuration option allocation/raid_stripe_all_devices.
	# Stripe across all PVs when RAID stripes are not specified.
	# If enabled, all PVs in the VG or on the command line are used for raid0/4/5/6/10
	# when the command does not specify the number of stripes to use.
	# This was the default behaviour until release 2.02.162.
	# This configuration option has an automatic default value.
	# raid_stripe_all_devices = 0

	# Configuration option allocation/cache_pool_metadata_require_separate_pvs.
	# Cache pool metadata and data will always use different PVs.
	cache_pool_metadata_require_separate_pvs = 0

	# Configuration option allocation/cache_mode.
	# The default cache mode used for new cache.
	# 
	# Accepted values:
	#   writethrough
	#     Data blocks are immediately written from the cache to disk.
	#   writeback
	#     Data blocks are written from the cache back to disk after some
	#     delay to improve performance.
	# 
	# This setting replaces allocation/cache_pool_cachemode.
	# This configuration option has an automatic default value.
	# cache_mode = "writethrough"

	# Configuration option allocation/cache_policy.
	# The default cache policy used for new cache volume.
	# Since kernel 4.2 the default policy is smq (Stochastic multique),
	# otherwise the older mq (Multiqueue) policy is selected.
	# This configuration option does not have a default value defined.

	# Configuration section allocation/cache_settings.
	# Settings for the cache policy.
	# See documentation for individual cache policies for more info.
	# This configuration section has an automatic default value.
	# cache_settings {
	# }

	# Configuration option allocation/cache_pool_chunk_size.
	# The minimal chunk size in KiB for cache pool volumes.
	# Using a chunk_size that is too large can result in wasteful use of
	# the cache, where small reads and writes can cause large sections of
	# an LV to be mapped into the cache. However, choosing a chunk_size
	# that is too small can result in more overhead trying to manage the
	# numerous chunks that become mapped into the cache. The former is
	# more of a problem than the latter in most cases, so the default is
	# on the smaller end of the spectrum. Supported values range from
	# 32KiB to 1GiB in multiples of 32.
	# This configuration option does not have a default value defined.

	# Configuration option allocation/thin_pool_metadata_require_separate_pvs.
	# Thin pool metdata and data will always use different PVs.
	thin_pool_metadata_require_separate_pvs = 0

	# Configuration option allocation/thin_pool_zero.
	# Thin pool data chunks are zeroed before they are first used.
	# Zeroing with a larger thin pool chunk size reduces performance.
	# This configuration option has an automatic default value.
	# thin_pool_zero = 1

	# Configuration option allocation/thin_pool_discards.
	# The discards behaviour of thin pool volumes.
	# 
	# Accepted values:
	#   ignore
	#   nopassdown
	#   passdown
	# 
	# This configuration option has an automatic default value.
	# thin_pool_discards = "passdown"

	# Configuration option allocation/thin_pool_chunk_size_policy.
	# The chunk size calculation policy for thin pool volumes.
	# 
	# Accepted values:
	#   generic
	#     If thin_pool_chunk_size is defined, use it. Otherwise, calculate
	#     the chunk size based on estimation and device hints exposed in
	#     sysfs - the minimum_io_size. The chunk size is always at least
	#     64KiB.
	#   performance
	#     If thin_pool_chunk_size is defined, use it. Otherwise, calculate
	#     the chunk size for performance based on device hints exposed in
	#     sysfs - the optimal_io_size. The chunk size is always at least
	#     512KiB.
	# 
	# This configuration option has an automatic default value.
	# thin_pool_chunk_size_policy = "generic"

	# Configuration option allocation/thin_pool_chunk_size.
	# The minimal chunk size in KiB for thin pool volumes.
	# Larger chunk sizes may improve performance for plain thin volumes,
	# however using them for snapshot volumes is less efficient, as it
	# consumes more space and takes extra time for copying. When unset,
	# lvm tries to estimate chunk size starting from 64KiB. Supported
	# values are in the range 64KiB to 1GiB.
	# This configuration option does not have a default value defined.

	# Configuration option allocation/physical_extent_size.
	# Default physical extent size in KiB to use for new VGs.
	# This configuration option has an automatic default value.
	# physical_extent_size = 4096
}

# Configuration section log.
# How LVM log information is reported.
log {

	# Configuration option log/report_command_log.
	# Enable or disable LVM log reporting.
	# If enabled, LVM will collect a log of operations, messages,
	# per-object return codes with object identification and associated
	# error numbers (errnos) during LVM command processing. Then the
	# log is either reported solely or in addition to any existing
	# reports, depending on LVM command used. If it is a reporting command
	# (e.g. pvs, vgs, lvs, lvm fullreport), then the log is reported in
	# addition to any existing reports. Otherwise, there's only log report
	# on output. For all applicable LVM commands, you can request that
	# the output has only log report by using --logonly command line
	# option. Use log/command_log_cols and log/command_log_sort settings
	# to define fields to display and sort fields for the log report.
	# You can also use log/command_log_selection to define selection
	# criteria used each time the log is reported.
	# This configuration option has an automatic default value.
	# report_command_log = 0

	# Configuration option log/command_log_sort.
	# List of columns to sort by when reporting command log.
	# See <lvm command> --logonly --configreport log -o help
	# for the list of possible fields.
	# This configuration option has an automatic default value.
	# command_log_sort = "log_seq_num"

	# Configuration option log/command_log_cols.
	# List of columns to report when reporting command log.
	# See <lvm command> --logonly --configreport log -o help
	# for the list of possible fields.
	# This configuration option has an automatic default value.
	# command_log_cols = "log_seq_num,log_type,log_context,log_object_type,log_object_name,log_object_id,log_object_group,log_object_group_id,log_message,log_errno,log_ret_code"

	# Configuration option log/command_log_selection.
	# Selection criteria used when reporting command log.
	# You can define selection criteria that are applied each
	# time log is reported. This way, it is possible to control the
	# amount of log that is displayed on output and you can select
	# only parts of the log that are important for you. To define
	# selection criteria, use fields from log report. See also
	# <lvm command> --logonly --configreport log -S help for the
	# list of possible fields and selection operators. You can also
	# define selection criteria for log report on command line directly
	# using <lvm command> --configreport log -S <selection criteria>
	# which has precedence over log/command_log_selection setting.
	# For more information about selection criteria in general, see
	# lvm(8) man page.
	# This configuration option has an automatic default value.
	# command_log_selection = "!(log_type=status && message=success)"

	# Configuration option log/verbose.
	# Controls the messages sent to stdout or stderr.
	verbose = 0

	# Configuration option log/silent.
	# Suppress all non-essential messages from stdout.
	# This has the same effect as -qq. When enabled, the following commands
	# still produce output: dumpconfig, lvdisplay, lvmdiskscan, lvs, pvck,
	# pvdisplay, pvs, version, vgcfgrestore -l, vgdisplay, vgs.
	# Non-essential messages are shifted from log level 4 to log level 5
	# for syslog and lvm2_log_fn purposes.
	# Any 'yes' or 'no' questions not overridden by other arguments are
	# suppressed and default to 'no'.
	silent = 0

	# Configuration option log/syslog.
	# Send log messages through syslog.
	syslog = 1

	# Configuration option log/file.
	# Write error and debug log messages to a file specified here.
	# This configuration option does not have a default value defined.

	# Configuration option log/overwrite.
	# Overwrite the log file each time the program is run.
	overwrite = 0

	# Configuration option log/level.
	# The level of log messages that are sent to the log file or syslog.
	# There are 6 syslog-like log levels currently in use: 2 to 7 inclusive.
	# 7 is the most verbose (LOG_DEBUG).
	level = 0

	# Configuration option log/indent.
	# Indent messages according to their severity.
	indent = 1

	# Configuration option log/command_names.
	# Display the command name on each line of output.
	command_names = 0

	# Configuration option log/prefix.
	# A prefix to use before the log message text.
	# (After the command name, if selected).
	# Two spaces allows you to see/grep the severity of each message.
	# To make the messages look similar to the original LVM tools use:
	# indent = 0, command_names = 1, prefix = " -- "
	prefix = "  "

	# Configuration option log/activation.
	# Log messages during activation.
	# Don't use this in low memory situations (can deadlock).
	activation = 0

	# Configuration option log/debug_classes.
	# Select log messages by class.
	# Some debugging messages are assigned to a class and only appear in
	# debug output if the class is listed here. Classes currently
	# available: memory, devices, activation, allocation, lvmetad,
	# metadata, cache, locking, lvmpolld. Use "all" to see everything.
	debug_classes = [ "memory", "devices", "activation", "allocation", "lvmetad", "metadata", "cache", "locking", "lvmpolld", "dbus" ]
}

# Configuration section backup.
# How LVM metadata is backed up and archived.
# In LVM, a 'backup' is a copy of the metadata for the current system,
# and an 'archive' contains old metadata configurations. They are
# stored in a human readable text format.
backup {

	# Configuration option backup/backup.
	# Maintain a backup of the current metadata configuration.
	# Think very hard before turning this off!
	backup = 1

	# Configuration option backup/backup_dir.
	# Location of the metadata backup files.
	# Remember to back up this directory regularly!
	backup_dir = "/etc/lvm/backup"

	# Configuration option backup/archive.
	# Maintain an archive of old metadata configurations.
	# Think very hard before turning this off.
	archive = 1

	# Configuration option backup/archive_dir.
	# Location of the metdata archive files.
	# Remember to back up this directory regularly!
	archive_dir = "/etc/lvm/archive"

	# Configuration option backup/retain_min.
	# Minimum number of archives to keep.
	retain_min = 10

	# Configuration option backup/retain_days.
	# Minimum number of days to keep archive files.
	retain_days = 30
}

# Configuration section shell.
# Settings for running LVM in shell (readline) mode.
shell {

	# Configuration option shell/history_size.
	# Number of lines of history to store in ~/.lvm_history.
	history_size = 100
}

# Configuration section global.
# Miscellaneous global LVM settings.
global {

	# Configuration option global/umask.
	# The file creation mask for any files and directories created.
	# Interpreted as octal if the first digit is zero.
	umask = 077

	# Configuration option global/test.
	# No on-disk metadata changes will be made in test mode.
	# Equivalent to having the -t option on every command.
	test = 0

	# Configuration option global/units.
	# Default value for --units argument.
	units = "h"

	# Configuration option global/si_unit_consistency.
	# Distinguish between powers of 1024 and 1000 bytes.
	# The LVM commands distinguish between powers of 1024 bytes,
	# e.g. KiB, MiB, GiB, and powers of 1000 bytes, e.g. KB, MB, GB.
	# If scripts depend on the old behaviour, disable this setting
	# temporarily until they are updated.
	si_unit_consistency = 1

	# Configuration option global/suffix.
	# Display unit suffix for sizes.
	# This setting has no effect if the units are in human-readable form
	# (global/units = "h") in which case the suffix is always displayed.
	suffix = 1

	# Configuration option global/activation.
	# Enable/disable communication with the kernel device-mapper.
	# Disable to use the tools to manipulate LVM metadata without
	# activating any logical volumes. If the device-mapper driver
	# is not present in the kernel, disabling this should suppress
	# the error messages.
	activation = 1

	# Configuration option global/fallback_to_lvm1.
	# Try running LVM1 tools if LVM cannot communicate with DM.
	# This option only applies to 2.4 kernels and is provided to help
	# switch between device-mapper kernels and LVM1 kernels. The LVM1
	# tools need to be installed with .lvm1 suffices, e.g. vgscan.lvm1.
	# They will stop working once the lvm2 on-disk metadata format is used.
	# This configuration option has an automatic default value.
	# fallback_to_lvm1 = 1

	# Configuration option global/format.
	# The default metadata format that commands should use.
	# The -M 1|2 option overrides this setting.
	# 
	# Accepted values:
	#   lvm1
	#   lvm2
	# 
	# This configuration option has an automatic default value.
	# format = "lvm2"

	# Configuration option global/format_libraries.
	# Shared libraries that process different metadata formats.
	# If support for LVM1 metadata was compiled as a shared library use
	# format_libraries = "liblvm2format1.so"
	# This configuration option does not have a default value defined.

	# Configuration option global/segment_libraries.
	# This configuration option does not have a default value defined.

	# Configuration option global/proc.
	# Location of proc filesystem.
	# This configuration option is advanced.
	proc = "/proc"

	# Configuration option global/etc.
	# Location of /etc system configuration directory.
	etc = "/etc"

	# Configuration option global/locking_type.
	# Type of locking to use.
	# 
	# Accepted values:
	#   0
	#     Turns off locking. Warning: this risks metadata corruption if
	#     commands run concurrently.
	#   1
	#     LVM uses local file-based locking, the standard mode.
	#   2
	#     LVM uses the external shared library locking_library.
	#   3
	#     LVM uses built-in clustered locking with clvmd.
	#     This is incompatible with lvmetad. If use_lvmetad is enabled,
	#     LVM prints a warning and disables lvmetad use.
	#   4
	#     LVM uses read-only locking which forbids any operations that
	#     might change metadata.
	#   5
	#     Offers dummy locking for tools that do not need any locks.
	#     You should not need to set this directly; the tools will select
	#     when to use it instead of the configured locking_type.
	#     Do not use lvmetad or the kernel device-mapper driver with this
	#     locking type. It is used by the --readonly option that offers
	#     read-only access to Volume Group metadata that cannot be locked
	#     safely because it belongs to an inaccessible domain and might be
	#     in use, for example a virtual machine image or a disk that is
	#     shared by a clustered machine.
	# 
    locking_type = 3

	# Configuration option global/wait_for_locks.
	# When disabled, fail if a lock request would block.
	wait_for_locks = 1

	# Configuration option global/fallback_to_clustered_locking.
	# Attempt to use built-in cluster locking if locking_type 2 fails.
	# If using external locking (type 2) and initialisation fails, with
	# this enabled, an attempt will be made to use the built-in clustered
	# locking. Disable this if using a customised locking_library.
	fallback_to_clustered_locking = 1

	# Configuration option global/fallback_to_local_locking.
	# Use locking_type 1 (local) if locking_type 2 or 3 fail.
	# If an attempt to initialise type 2 or type 3 locking failed, perhaps
	# because cluster components such as clvmd are not running, with this
	# enabled, an attempt will be made to use local file-based locking
	# (type 1). If this succeeds, only commands against local VGs will
	# proceed. VGs marked as clustered will be ignored.
	fallback_to_local_locking = 1

	# Configuration option global/locking_dir.
	# Directory to use for LVM command file locks.
	# Local non-LV directory that holds file-based locks while commands are
	# in progress. A directory like /tmp that may get wiped on reboot is OK.
	locking_dir = "/run/lock/lvm"

	# Configuration option global/prioritise_write_locks.
	# Allow quicker VG write access during high volume read access.
	# When there are competing read-only and read-write access requests for
	# a volume group's metadata, instead of always granting the read-only
	# requests immediately, delay them to allow the read-write requests to
	# be serviced. Without this setting, write access may be stalled by a
	# high volume of read-only requests. This option only affects
	# locking_type 1 viz. local file-based locking.
	prioritise_write_locks = 1

	# Configuration option global/library_dir.
	# Search this directory first for shared libraries.
	# This configuration option does not have a default value defined.

	# Configuration option global/locking_library.
	# The external locking library to use for locking_type 2.
	# This configuration option has an automatic default value.
	# locking_library = "liblvm2clusterlock.so"

	# Configuration option global/abort_on_internal_errors.
	# Abort a command that encounters an internal error.
	# Treat any internal errors as fatal errors, aborting the process that
	# encountered the internal error. Please only enable for debugging.
	abort_on_internal_errors = 0

	# Configuration option global/detect_internal_vg_cache_corruption.
	# Internal verification of VG structures.
	# Check if CRC matches when a parsed VG is used multiple times. This
	# is useful to catch unexpected changes to cached VG structures.
	# Please only enable for debugging.
	detect_internal_vg_cache_corruption = 0

	# Configuration option global/metadata_read_only.
	# No operations that change on-disk metadata are permitted.
	# Additionally, read-only commands that encounter metadata in need of
	# repair will still be allowed to proceed exactly as if the repair had
	# been performed (except for the unchanged vg_seqno). Inappropriate
	# use could mess up your system, so seek advice first!
	metadata_read_only = 0

	# Configuration option global/mirror_segtype_default.
	# The segment type used by the short mirroring option -m.
	# The --type mirror|raid1 option overrides this setting.
	# 
	# Accepted values:
	#   mirror
	#     The original RAID1 implementation from LVM/DM. It is
	#     characterized by a flexible log solution (core, disk, mirrored),
	#     and by the necessity to block I/O while handling a failure.
	#     There is an inherent race in the dmeventd failure handling logic
	#     with snapshots of devices using this type of RAID1 that in the
	#     worst case could cause a deadlock. (Also see
	#     devices/ignore_lvm_mirrors.)
	#   raid1
	#     This is a newer RAID1 implementation using the MD RAID1
	#     personality through device-mapper. It is characterized by a
	#     lack of log options. (A log is always allocated for every
	#     device and they are placed on the same device as the image,
	#     so no separate devices are required.) This mirror
	#     implementation does not require I/O to be blocked while
	#     handling a failure. This mirror implementation is not
	#     cluster-aware and cannot be used in a shared (active/active)
	#     fashion in a cluster.
	# 
	mirror_segtype_default = "raid1"

	# Configuration option global/raid10_segtype_default.
	# The segment type used by the -i -m combination.
	# The --type raid10|mirror option overrides this setting.
	# The --stripes/-i and --mirrors/-m options can both be specified
	# during the creation of a logical volume to use both striping and
	# mirroring for the LV. There are two different implementations.
	# 
	# Accepted values:
	#   raid10
	#     LVM uses MD's RAID10 personality through DM. This is the
	#     preferred option.
	#   mirror
	#     LVM layers the 'mirror' and 'stripe' segment types. The layering
	#     is done by creating a mirror LV on top of striped sub-LVs,
	#     effectively creating a RAID 0+1 array. The layering is suboptimal
	#     in terms of providing redundancy and performance.
	# 
	raid10_segtype_default = "raid10"

	# Configuration option global/sparse_segtype_default.
	# The segment type used by the -V -L combination.
	# The --type snapshot|thin option overrides this setting.
	# The combination of -V and -L options creates a sparse LV. There are
	# two different implementations.
	# 
	# Accepted values:
	#   snapshot
	#     The original snapshot implementation from LVM/DM. It uses an old
	#     snapshot that mixes data and metadata within a single COW
	#     storage volume and performs poorly when the size of stored data
	#     passes hundreds of MB.
	#   thin
	#     A newer implementation that uses thin provisioning. It has a
	#     bigger minimal chunk size (64KiB) and uses a separate volume for
	#     metadata. It has better performance, especially when more data
	#     is used. It also supports full snapshots.
	# 
	sparse_segtype_default = "thin"

	# Configuration option global/lvdisplay_shows_full_device_path.
	# Enable this to reinstate the previous lvdisplay name format.
	# The default format for displaying LV names in lvdisplay was changed
	# in version 2.02.89 to show the LV name and path separately.
	# Previously this was always shown as /dev/vgname/lvname even when that
	# was never a valid path in the /dev filesystem.
	# This configuration option has an automatic default value.
	# lvdisplay_shows_full_device_path = 0

	# Configuration option global/use_lvmetad.
	# Use lvmetad to cache metadata and reduce disk scanning.
	# When enabled (and running), lvmetad provides LVM commands with VG
	# metadata and PV state. LVM commands then avoid reading this
	# information from disks which can be slow. When disabled (or not
	# running), LVM commands fall back to scanning disks to obtain VG
	# metadata. lvmetad is kept updated via udev rules which must be set
	# up for LVM to work correctly. (The udev rules should be installed
	# by default.) Without a proper udev setup, changes in the system's
	# block device configuration will be unknown to LVM, and ignored
	# until a manual 'pvscan --cache' is run. If lvmetad was running
	# while use_lvmetad was disabled, it must be stopped, use_lvmetad
	# enabled, and then started. When using lvmetad, LV activation is
	# switched to an automatic, event-based mode. In this mode, LVs are
	# activated based on incoming udev events that inform lvmetad when
	# PVs appear on the system. When a VG is complete (all PVs present),
	# it is auto-activated. The auto_activation_volume_list setting
	# controls which LVs are auto-activated (all by default.)
	# When lvmetad is updated (automatically by udev events, or directly
	# by pvscan --cache), devices/filter is ignored and all devices are
	# scanned by default. lvmetad always keeps unfiltered information
	# which is provided to LVM commands. Each LVM command then filters
	# based on devices/filter. This does not apply to other, non-regexp,
	# filtering settings: component filters such as multipath and MD
	# are checked during pvscan --cache. To filter a device and prevent
	# scanning from the LVM system entirely, including lvmetad, use
	# devices/global_filter.
    use_lvmetad = 0

	# Configuration option global/lvmetad_update_wait_time.
	# The number of seconds a command will wait for lvmetad update to finish.
	# After waiting for this period, a command will not use lvmetad, and
	# will revert to disk scanning.
	# This configuration option has an automatic default value.
	# lvmetad_update_wait_time = 10

	# Configuration option global/use_lvmlockd.
	# Use lvmlockd for locking among hosts using LVM on shared storage.
	# Applicable only if LVM is compiled with lockd support in which
	# case there is also lvmlockd(8) man page available for more
	# information.
	use_lvmlockd = 0

	# Configuration option global/lvmlockd_lock_retries.
	# Retry lvmlockd lock requests this many times.
	# Applicable only if LVM is compiled with lockd support
	# This configuration option has an automatic default value.
	# lvmlockd_lock_retries = 3

	# Configuration option global/sanlock_lv_extend.
	# Size in MiB to extend the internal LV holding sanlock locks.
	# The internal LV holds locks for each LV in the VG, and after enough
	# LVs have been created, the internal LV needs to be extended. lvcreate
	# will automatically extend the internal LV when needed by the amount
	# specified here. Setting this to 0 disables the automatic extension
	# and can cause lvcreate to fail. Applicable only if LVM is compiled
	# with lockd support
	# This configuration option has an automatic default value.
	# sanlock_lv_extend = 256

	# Configuration option global/thin_check_executable.
	# The full path to the thin_check command.
	# LVM uses this command to check that a thin metadata device is in a
	# usable state. When a thin pool is activated and after it is
	# deactivated, this command is run. Activation will only proceed if
	# the command has an exit status of 0. Set to "" to skip this check.
	# (Not recommended.) Also see thin_check_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_check_executable = "/usr/sbin/thin_check"

	# Configuration option global/thin_dump_executable.
	# The full path to the thin_dump command.
	# LVM uses this command to dump thin pool metadata.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_dump_executable = "/usr/sbin/thin_dump"

	# Configuration option global/thin_repair_executable.
	# The full path to the thin_repair command.
	# LVM uses this command to repair a thin metadata device if it is in
	# an unusable state. Also see thin_repair_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_repair_executable = "/usr/sbin/thin_repair"

	# Configuration option global/thin_check_options.
	# List of options passed to the thin_check command.
	# With thin_check version 2.1 or newer you can add the option
	# --ignore-non-fatal-errors to let it pass through ignorable errors
	# and fix them later. With thin_check version 3.2 or newer you should
	# include the option --clear-needs-check-flag.
	# This configuration option has an automatic default value.
	# thin_check_options = [ "-q", "--clear-needs-check-flag" ]

	# Configuration option global/thin_repair_options.
	# List of options passed to the thin_repair command.
	# This configuration option has an automatic default value.
	# thin_repair_options = [ "" ]

	# Configuration option global/thin_disabled_features.
	# Features to not use in the thin driver.
	# This can be helpful for testing, or to avoid using a feature that is
	# causing problems. Features include: block_size, discards,
	# discards_non_power_2, external_origin, metadata_resize,
	# external_origin_extend, error_if_no_space.
	# 
	# Example
	# thin_disabled_features = [ "discards", "block_size" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option global/cache_disabled_features.
	# Features to not use in the cache driver.
	# This can be helpful for testing, or to avoid using a feature that is
	# causing problems. Features include: policy_mq, policy_smq.
	# 
	# Example
	# cache_disabled_features = [ "policy_smq" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option global/cache_check_executable.
	# The full path to the cache_check command.
	# LVM uses this command to check that a cache metadata device is in a
	# usable state. When a cached LV is activated and after it is
	# deactivated, this command is run. Activation will only proceed if the
	# command has an exit status of 0. Set to "" to skip this check.
	# (Not recommended.) Also see cache_check_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_check_executable = "/usr/sbin/cache_check"

	# Configuration option global/cache_dump_executable.
	# The full path to the cache_dump command.
	# LVM uses this command to dump cache pool metadata.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_dump_executable = "/usr/sbin/cache_dump"

	# Configuration option global/cache_repair_executable.
	# The full path to the cache_repair command.
	# LVM uses this command to repair a cache metadata device if it is in
	# an unusable state. Also see cache_repair_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_repair_executable = "/usr/sbin/cache_repair"

	# Configuration option global/cache_check_options.
	# List of options passed to the cache_check command.
	# With cache_check version 5.0 or newer you should include the option
	# --clear-needs-check-flag.
	# This configuration option has an automatic default value.
	# cache_check_options = [ "-q", "--clear-needs-check-flag" ]

	# Configuration option global/cache_repair_options.
	# List of options passed to the cache_repair command.
	# This configuration option has an automatic default value.
	# cache_repair_options = [ "" ]

	# Configuration option global/system_id_source.
	# The method LVM uses to set the local system ID.
	# Volume Groups can also be given a system ID (by vgcreate, vgchange,
	# or vgimport.) A VG on shared storage devices is accessible only to
	# the host with a matching system ID. See 'man lvmsystemid' for
	# information on limitations and correct usage.
	# 
	# Accepted values:
	#   none
	#     The host has no system ID.
	#   lvmlocal
	#     Obtain the system ID from the system_id setting in the 'local'
	#     section of an lvm configuration file, e.g. lvmlocal.conf.
	#   uname
	#     Set the system ID from the hostname (uname) of the system.
	#     System IDs beginning localhost are not permitted.
	#   machineid
	#     Use the contents of the machine-id file to set the system ID.
	#     Some systems create this file at installation time.
	#     See 'man machine-id' and global/etc.
	#   file
	#     Use the contents of another file (system_id_file) to set the
	#     system ID.
	# 
	system_id_source = "none"

	# Configuration option global/system_id_file.
	# The full path to the file containing a system ID.
	# This is used when system_id_source is set to 'file'.
	# Comments starting with the character # are ignored.
	# This configuration option does not have a default value defined.

	# Configuration option global/use_lvmpolld.
	# Use lvmpolld to supervise long running LVM commands.
	# When enabled, control of long running LVM commands is transferred
	# from the original LVM command to the lvmpolld daemon. This allows
	# the operation to continue independent of the original LVM command.
	# After lvmpolld takes over, the LVM command displays the progress
	# of the ongoing operation. lvmpolld itself runs LVM commands to
	# manage the progress of ongoing operations. lvmpolld can be used as
	# a native systemd service, which allows it to be started on demand,
	# and to use its own control group. When this option is disabled, LVM
	# commands will supervise long running operations by forking themselves.
	# Applicable only if LVM is compiled with lvmpolld support.
	use_lvmpolld = 1

	# Configuration option global/notify_dbus.
	# Enable D-Bus notification from LVM commands.
	# When enabled, an LVM command that changes PVs, changes VG metadata,
	# or changes the activation state of an LV will send a notification.
	notify_dbus = 1
}

# Configuration section activation.
activation {

	# Configuration option activation/checks.
	# Perform internal checks of libdevmapper operations.
	# Useful for debugging problems with activation. Some of the checks may
	# be expensive, so it's best to use this only when there seems to be a
	# problem.
	checks = 0

	# Configuration option activation/udev_sync.
	# Use udev notifications to synchronize udev and LVM.
	# The --nodevsync option overrides this setting.
	# When disabled, LVM commands will not wait for notifications from
	# udev, but continue irrespective of any possible udev processing in
	# the background. Only use this if udev is not running or has rules
	# that ignore the devices LVM creates. If enabled when udev is not
	# running, and LVM processes are waiting for udev, run the command
	# 'dmsetup udevcomplete_all' to wake them up.
	udev_sync = 1

	# Configuration option activation/udev_rules.
	# Use udev rules to manage LV device nodes and symlinks.
	# When disabled, LVM will manage the device nodes and symlinks for
	# active LVs itself. Manual intervention may be required if this
	# setting is changed while LVs are active.
	udev_rules = 1

	# Configuration option activation/verify_udev_operations.
	# Use extra checks in LVM to verify udev operations.
	# This enables additional checks (and if necessary, repairs) on entries
	# in the device directory after udev has completed processing its
	# events. Useful for diagnosing problems with LVM/udev interactions.
	verify_udev_operations = 0

	# Configuration option activation/retry_deactivation.
	# Retry failed LV deactivation.
	# If LV deactivation fails, LVM will retry for a few seconds before
	# failing. This may happen because a process run from a quick udev rule
	# temporarily opened the device.
	retry_deactivation = 1

	# Configuration option activation/missing_stripe_filler.
	# Method to fill missing stripes when activating an incomplete LV.
	# Using 'error' will make inaccessible parts of the device return I/O
	# errors on access. You can instead use a device path, in which case,
	# that device will be used in place of missing stripes. Using anything
	# other than 'error' with mirrored or snapshotted volumes is likely to
	# result in data corruption.
	# This configuration option is advanced.
	missing_stripe_filler = "error"

	# Configuration option activation/use_linear_target.
	# Use the linear target to optimize single stripe LVs.
	# When disabled, the striped target is used. The linear target is an
	# optimised version of the striped target that only handles a single
	# stripe.
	use_linear_target = 1

	# Configuration option activation/reserved_stack.
	# Stack size in KiB to reserve for use while devices are suspended.
	# Insufficent reserve risks I/O deadlock during device suspension.
	reserved_stack = 64

	# Configuration option activation/reserved_memory.
	# Memory size in KiB to reserve for use while devices are suspended.
	# Insufficent reserve risks I/O deadlock during device suspension.
	reserved_memory = 8192

	# Configuration option activation/process_priority.
	# Nice value used while devices are suspended.
	# Use a high priority so that LVs are suspended
	# for the shortest possible time.
	process_priority = -18

	# Configuration option activation/volume_list.
	# Only LVs selected by this list are activated.
	# If this list is defined, an LV is only activated if it matches an
	# entry in this list. If this list is undefined, it imposes no limits
	# on LV activation (all are allowed).
	# 
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	# 
	# Example
	# volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option activation/auto_activation_volume_list.
	# Only LVs selected by this list are auto-activated.
	# This list works like volume_list, but it is used only by
	# auto-activation commands. It does not apply to direct activation
	# commands. If this list is defined, an LV is only auto-activated
	# if it matches an entry in this list. If this list is undefined, it
	# imposes no limits on LV auto-activation (all are allowed.) If this
	# list is defined and empty, i.e. "[]", then no LVs are selected for
	# auto-activation. An LV that is selected by this list for
	# auto-activation, must also be selected by volume_list (if defined)
	# before it is activated. Auto-activation is an activation command that
	# includes the 'a' argument: --activate ay or -a ay. The 'a' (auto)
	# argument for auto-activation is meant to be used by activation
	# commands that are run automatically by the system, as opposed to LVM
	# commands run directly by a user. A user may also use the 'a' flag
	# directly to perform auto-activation. Also see pvscan(8) for more
	# information about auto-activation.
	# 
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	# 
	# Example
	# auto_activation_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option activation/read_only_volume_list.
	# LVs in this list are activated in read-only mode.
	# If this list is defined, each LV that is to be activated is checked
	# against this list, and if it matches, it is activated in read-only
	# mode. This overrides the permission setting stored in the metadata,
	# e.g. from --permission rw.
	# 
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	# 
	# Example
	# read_only_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	# 
	# This configuration option does not have a default value defined.

	# Configuration option activation/raid_region_size.
	# Size in KiB of each raid or mirror synchronization region.
	# For raid or mirror segment types, this is the amount of data that is
	# copied at once when initializing, or moved at once by pvmove.
	raid_region_size = 512

	# Configuration option activation/error_when_full.
	# Return errors if a thin pool runs out of space.
	# The --errorwhenfull option overrides this setting.
	# When enabled, writes to thin LVs immediately return an error if the
	# thin pool is out of data space. When disabled, writes to thin LVs
	# are queued if the thin pool is out of space, and processed when the
	# thin pool data space is extended. New thin pools are assigned the
	# behavior defined here.
	# This configuration option has an automatic default value.
	# error_when_full = 0

	# Configuration option activation/readahead.
	# Setting to use when there is no readahead setting in metadata.
	# 
	# Accepted values:
	#   none
	#     Disable readahead.
	#   auto
	#     Use default value chosen by kernel.
	# 
	readahead = "auto"

	# Configuration option activation/raid_fault_policy.
	# Defines how a device failure in a RAID LV is handled.
	# This includes LVs that have the following segment types:
	# raid1, raid4, raid5*, and raid6*.
	# If a device in the LV fails, the policy determines the steps
	# performed by dmeventd automatically, and the steps perfomed by the
	# manual command lvconvert --repair --use-policies.
	# Automatic handling requires dmeventd to be monitoring the LV.
	# 
	# Accepted values:
	#   warn
	#     Use the system log to warn the user that a device in the RAID LV
	#     has failed. It is left to the user to run lvconvert --repair
	#     manually to remove or replace the failed device. As long as the
	#     number of failed devices does not exceed the redundancy of the LV
	#     (1 device for raid4/5, 2 for raid6), the LV will remain usable.
	#   allocate
	#     Attempt to use any extra physical volumes in the VG as spares and
	#     replace faulty devices.
	# 
	raid_fault_policy = "warn"

	# Configuration option activation/mirror_image_fault_policy.
	# Defines how a device failure in a 'mirror' LV is handled.
	# An LV with the 'mirror' segment type is composed of mirror images
	# (copies) and a mirror log. A disk log ensures that a mirror LV does
	# not need to be re-synced (all copies made the same) every time a
	# machine reboots or crashes. If a device in the LV fails, this policy
	# determines the steps perfomed by dmeventd automatically, and the steps
	# performed by the manual command lvconvert --repair --use-policies.
	# Automatic handling requires dmeventd to be monitoring the LV.
	# 
	# Accepted values:
	#   remove
	#     Simply remove the faulty device and run without it. If the log
	#     device fails, the mirror would convert to using an in-memory log.
	#     This means the mirror will not remember its sync status across
	#     crashes/reboots and the entire mirror will be re-synced. If a
	#     mirror image fails, the mirror will convert to a non-mirrored
	#     device if there is only one remaining good copy.
	#   allocate
	#     Remove the faulty device and try to allocate space on a new
	#     device to be a replacement for the failed device. Using this
	#     policy for the log is fast and maintains the ability to remember
	#     sync state through crashes/reboots. Using this policy for a
	#     mirror device is slow, as it requires the mirror to resynchronize
	#     the devices, but it will preserve the mirror characteristic of
	#     the device. This policy acts like 'remove' if no suitable device
	#     and space can be allocated for the replacement.
	#   allocate_anywhere
	#     Not yet implemented. Useful to place the log device temporarily
	#     on the same physical volume as one of the mirror images. This
	#     policy is not recommended for mirror devices since it would break
	#     the redundant nature of the mirror. This policy acts like
	#     'remove' if no suitable device and space can be allocated for the
	#     replacement.
	# 
	mirror_image_fault_policy = "remove"

	# Configuration option activation/mirror_log_fault_policy.
	# Defines how a device failure in a 'mirror' log LV is handled.
	# The mirror_image_fault_policy description for mirrored LVs also
	# applies to mirrored log LVs.
	mirror_log_fault_policy = "allocate"

	# Configuration option activation/snapshot_autoextend_threshold.
	# Auto-extend a snapshot when its usage exceeds this percent.
	# Setting this to 100 disables automatic extension.
	# The minimum value is 50 (a smaller value is treated as 50.)
	# Also see snapshot_autoextend_percent.
	# Automatic extension requires dmeventd to be monitoring the LV.
	# 
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# snapshot exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# snapshot_autoextend_threshold = 70
	# 
	snapshot_autoextend_threshold = 100

	# Configuration option activation/snapshot_autoextend_percent.
	# Auto-extending a snapshot adds this percent extra space.
	# The amount of additional space added to a snapshot is this
	# percent of its current size.
	# 
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# snapshot exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# snapshot_autoextend_percent = 20
	# 
	snapshot_autoextend_percent = 20

	# Configuration option activation/thin_pool_autoextend_threshold.
	# Auto-extend a thin pool when its usage exceeds this percent.
	# Setting this to 100 disables automatic extension.
	# The minimum value is 50 (a smaller value is treated as 50.)
	# Also see thin_pool_autoextend_percent.
	# Automatic extension requires dmeventd to be monitoring the LV.
	# 
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# thin pool exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# thin_pool_autoextend_threshold = 70
	# 
	thin_pool_autoextend_threshold = 100

	# Configuration option activation/thin_pool_autoextend_percent.
	# Auto-extending a thin pool adds this percent extra space.
	# The amount of additional space added to a thin pool is this
	# percent of its current size.
	# 
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# thin pool exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# thin_pool_autoextend_percent = 20
	# 
	thin_pool_autoextend_percent = 20

	# Configuration option activation/mlock_filter.
	# Do not mlock these memory areas.
	# While activating devices, I/O to devices being (re)configured is
	# suspended. As a precaution against deadlocks, LVM pins memory it is
	# using so it is not paged out, and will not require I/O to reread.
	# Groups of pages that are known not to be accessed during activation
	# do not need to be pinned into memory. Each string listed in this
	# setting is compared against each line in /proc/self/maps, and the
	# pages corresponding to lines that match are not pinned. On some
	# systems, locale-archive was found to make up over 80% of the memory
	# used by the process.
	# 
	# Example
	# mlock_filter = [ "locale/locale-archive", "gconv/gconv-modules.cache" ]
	# 
	# This configuration option is advanced.
	# This configuration option does not have a default value defined.

	# Configuration option activation/use_mlockall.
	# Use the old behavior of mlockall to pin all memory.
	# Prior to version 2.02.62, LVM used mlockall() to pin the whole
	# process's memory while activating devices.
	use_mlockall = 0

	# Configuration option activation/monitoring.
	# Monitor LVs that are activated.
	# The --ignoremonitoring option overrides this setting.
	# When enabled, LVM will ask dmeventd to monitor activated LVs.
	monitoring = 1

	# Configuration option activation/polling_interval.
	# Check pvmove or lvconvert progress at this interval (seconds).
	# When pvmove or lvconvert must wait for the kernel to finish
	# synchronising or merging data, they check and report progress at
	# intervals of this number of seconds. If this is set to 0 and there
	# is only one thing to wait for, there are no progress reports, but
	# the process is awoken immediately once the operation is complete.
	polling_interval = 15

	# Configuration option activation/auto_set_activation_skip.
	# Set the activation skip flag on new thin snapshot LVs.
	# The --setactivationskip option overrides this setting.
	# An LV can have a persistent 'activation skip' flag. The flag causes
	# the LV to be skipped during normal activation. The lvchange/vgchange
	# -K option is required to activate LVs that have the activation skip
	# flag set. When this setting is enabled, the activation skip flag is
	# set on new thin snapshot LVs.
	# This configuration option has an automatic default value.
	# auto_set_activation_skip = 1

	# Configuration option activation/activation_mode.
	# How LVs with missing devices are activated.
	# The --activationmode option overrides this setting.
	# 
	# Accepted values:
	#   complete
	#     Only allow activation of an LV if all of the Physical Volumes it
	#     uses are present. Other PVs in the Volume Group may be missing.
	#   degraded
	#     Like complete, but additionally RAID LVs of segment type raid1,
	#     raid4, raid5, radid6 and raid10 will be activated if there is no
	#     data loss, i.e. they have sufficient redundancy to present the
	#     entire addressable range of the Logical Volume.
	#   partial
	#     Allows the activation of any LV even if a missing or failed PV
	#     could cause data loss with a portion of the LV inaccessible.
	#     This setting should not normally be used, but may sometimes
	#     assist with data recovery.
	# 
	activation_mode = "degraded"

	# Configuration option activation/lock_start_list.
	# Locking is started only for VGs selected by this list.
	# The rules are the same as those for volume_list.
	# This configuration option does not have a default value defined.

	# Configuration option activation/auto_lock_start_list.
	# Locking is auto-started only for VGs selected by this list.
	# The rules are the same as those for auto_activation_volume_list.
	# This configuration option does not have a default value defined.
}

# Configuration section metadata.
# This configuration section has an automatic default value.
# metadata {

	# Configuration option metadata/check_pv_device_sizes.
	# Check device sizes are not smaller than corresponding PV sizes.
	# If device size is less than corresponding PV size found in metadata,
	# there is always a risk of data loss. If this option is set, then LVM
	# issues a warning message each time it finds that the device size is
	# less than corresponding PV size. You should not disable this unless
	# you are absolutely sure about what you are doing!
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# check_pv_device_sizes = 1

	# Configuration option metadata/record_lvs_history.
	# When enabled, LVM keeps history records about removed LVs in
	# metadata. The information that is recorded in metadata for
	# historical LVs is reduced when compared to original
	# information kept in metadata for live LVs. Currently, this
	# feature is supported for thin and thin snapshot LVs only.
	# This configuration option has an automatic default value.
	# record_lvs_history = 0

	# Configuration option metadata/lvs_history_retention_time.
	# Retention time in seconds after which a record about individual
	# historical logical volume is automatically destroyed.
	# A value of 0 disables this feature.
	# This configuration option has an automatic default value.
	# lvs_history_retention_time = 0

	# Configuration option metadata/pvmetadatacopies.
	# Number of copies of metadata to store on each PV.
	# The --pvmetadatacopies option overrides this setting.
	# 
	# Accepted values:
	#   2
	#     Two copies of the VG metadata are stored on the PV, one at the
	#     front of the PV, and one at the end.
	#   1
	#     One copy of VG metadata is stored at the front of the PV.
	#   0
	#     No copies of VG metadata are stored on the PV. This may be
	#     useful for VGs containing large numbers of PVs.
	# 
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# pvmetadatacopies = 1

	# Configuration option metadata/vgmetadatacopies.
	# Number of copies of metadata to maintain for each VG.
	# The --vgmetadatacopies option overrides this setting.
	# If set to a non-zero value, LVM automatically chooses which of the
	# available metadata areas to use to achieve the requested number of
	# copies of the VG metadata. If you set a value larger than the the
	# total number of metadata areas available, then metadata is stored in
	# them all. The value 0 (unmanaged) disables this automatic management
	# and allows you to control which metadata areas are used at the
	# individual PV level using pvchange --metadataignore y|n.
	# This configuration option has an automatic default value.
	# vgmetadatacopies = 0

	# Configuration option metadata/pvmetadatasize.
	# Approximate number of sectors to use for each metadata copy.
	# VGs with large numbers of PVs or LVs, or VGs containing complex LV
	# structures, may need additional space for VG metadata. The metadata
	# areas are treated as circular buffers, so unused space becomes filled
	# with an archive of the most recent previous versions of the metadata.
	# This configuration option has an automatic default value.
	# pvmetadatasize = 255

	# Configuration option metadata/pvmetadataignore.
	# Ignore metadata areas on a new PV.
	# The --metadataignore option overrides this setting.
	# If metadata areas on a PV are ignored, LVM will not store metadata
	# in them.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# pvmetadataignore = 0

	# Configuration option metadata/stripesize.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# stripesize = 64

	# Configuration option metadata/dirs.
	# Directories holding live copies of text format metadata.
	# These directories must not be on logical volumes!
	# It's possible to use LVM with a couple of directories here,
	# preferably on different (non-LV) filesystems, and with no other
	# on-disk metadata (pvmetadatacopies = 0). Or this can be in addition
	# to on-disk metadata areas. The feature was originally added to
	# simplify testing and is not supported under low memory situations -
	# the machine could lock up. Never edit any files in these directories
	# by hand unless you are absolutely sure you know what you are doing!
	# Use the supplied toolset to make changes (e.g. vgcfgrestore).
	# 
	# Example
	# dirs = [ "/etc/lvm/metadata", "/mnt/disk2/lvm/metadata2" ]
	# 
	# This configuration option is advanced.
	# This configuration option does not have a default value defined.
# }

# Configuration section report.
# LVM report command output formatting.
# This configuration section has an automatic default value.
# report {

	# Configuration option report/output_format.
	# Format of LVM command's report output.
	# If there is more than one report per command, then the format
	# is applied for all reports. You can also change output format
	# directly on command line using --reportformat option which
	# has precedence over log/output_format setting.
	# Accepted values:
	#   basic
	#     Original format with columns and rows. If there is more than
	#     one report per command, each report is prefixed with report's
	#     name for identification.
	#   json
	#     JSON format.
	# This configuration option has an automatic default value.
	# output_format = "basic"

	# Configuration option report/compact_output.
	# Do not print empty values for all report fields.
	# If enabled, all fields that don't have a value set for any of the
	# rows reported are skipped and not printed. Compact output is
	# applicable only if report/buffered is enabled. If you need to
	# compact only specified fields, use compact_output=0 and define
	# report/compact_output_cols configuration setting instead.
	# This configuration option has an automatic default value.
	# compact_output = 0

	# Configuration option report/compact_output_cols.
	# Do not print empty values for specified report fields.
	# If defined, specified fields that don't have a value set for any
	# of the rows reported are skipped and not printed. Compact output
	# is applicable only if report/buffered is enabled. If you need to
	# compact all fields, use compact_output=1 instead in which case
	# the compact_output_cols setting is then ignored.
	# This configuration option has an automatic default value.
	# compact_output_cols = ""

	# Configuration option report/aligned.
	# Align columns in report output.
	# This configuration option has an automatic default value.
	# aligned = 1

	# Configuration option report/buffered.
	# Buffer report output.
	# When buffered reporting is used, the report's content is appended
	# incrementally to include each object being reported until the report
	# is flushed to output which normally happens at the end of command
	# execution. Otherwise, if buffering is not used, each object is
	# reported as soon as its processing is finished.
	# This configuration option has an automatic default value.
	# buffered = 1

	# Configuration option report/headings.
	# Show headings for columns on report.
	# This configuration option has an automatic default value.
	# headings = 1

	# Configuration option report/separator.
	# A separator to use on report after each field.
	# This configuration option has an automatic default value.
	# separator = " "

	# Configuration option report/list_item_separator.
	# A separator to use for list items when reported.
	# This configuration option has an automatic default value.
	# list_item_separator = ","

	# Configuration option report/prefixes.
	# Use a field name prefix for each field reported.
	# This configuration option has an automatic default value.
	# prefixes = 0

	# Configuration option report/quoted.
	# Quote field values when using field name prefixes.
	# This configuration option has an automatic default value.
	# quoted = 1

	# Configuration option report/colums_as_rows.
	# Output each column as a row.
	# If set, this also implies report/prefixes=1.
	# This configuration option has an automatic default value.
	# colums_as_rows = 0

	# Configuration option report/binary_values_as_numeric.
	# Use binary values 0 or 1 instead of descriptive literal values.
	# For columns that have exactly two valid values to report
	# (not counting the 'unknown' value which denotes that the
	# value could not be determined).
	# This configuration option has an automatic default value.
	# binary_values_as_numeric = 0

	# Configuration option report/time_format.
	# Set time format for fields reporting time values.
	# Format specification is a string which may contain special character
	# sequences and ordinary character sequences. Ordinary character
	# sequences are copied verbatim. Each special character sequence is
	# introduced by the '%' character and such sequence is then
	# substituted with a value as described below.
	# 
	# Accepted values:
	#   %a
	#     The abbreviated name of the day of the week according to the
	#     current locale.
	#   %A
	#     The full name of the day of the week according to the current
	#     locale.
	#   %b
	#     The abbreviated month name according to the current locale.
	#   %B
	#     The full month name according to the current locale.
	#   %c
	#     The preferred date and time representation for the current
	#     locale (alt E)
	#   %C
	#     The century number (year/100) as a 2-digit integer. (alt E)
	#   %d
	#     The day of the month as a decimal number (range 01 to 31).
	#     (alt O)
	#   %D
	#     Equivalent to %m/%d/%y. (For Americans only. Americans should
	#     note that in other countries%d/%m/%y is rather common. This
	#     means that in international context this format is ambiguous and
	#     should not be used.
	#   %e
	#     Like %d, the day of the month as a decimal number, but a leading
	#     zero is replaced by a space. (alt O)
	#   %E
	#     Modifier: use alternative local-dependent representation if
	#     available.
	#   %F
	#     Equivalent to %Y-%m-%d (the ISO 8601 date format).
	#   %G
	#     The ISO 8601 week-based year with century as adecimal number.
	#     The 4-digit year corresponding to the ISO week number (see %V).
	#     This has the same format and value as %Y, except that if the
	#     ISO week number belongs to the previous or next year, that year
	#     is used instead.
	#   %g
	#     Like %G, but without century, that is, with a 2-digit year
	#     (00-99).
	#   %h
	#     Equivalent to %b.
	#   %H
	#     The hour as a decimal number using a 24-hour clock
	#     (range 00 to 23). (alt O)
	#   %I
	#     The hour as a decimal number using a 12-hour clock
	#     (range 01 to 12). (alt O)
	#   %j
	#     The day of the year as a decimal number (range 001 to 366).
	#   %k
	#     The hour (24-hour clock) as a decimal number (range 0 to 23);
	#     single digits are preceded by a blank. (See also %H.)
	#   %l
	#     The hour (12-hour clock) as a decimal number (range 1 to 12);
	#     single digits are preceded by a blank. (See also %I.)
	#   %m
	#     The month as a decimal number (range 01 to 12). (alt O)
	#   %M
	#     The minute as a decimal number (range 00 to 59). (alt O)
	#   %O
	#     Modifier: use alternative numeric symbols.
	#   %p
	#     Either "AM" or "PM" according to the given time value,
	#     or the corresponding strings for the current locale. Noon is
	#     treated as "PM" and midnight as "AM".
	#   %P
	#     Like %p but in lowercase: "am" or "pm" or a corresponding
	#     string for the current locale.
	#   %r
	#     The time in a.m. or p.m. notation. In the POSIX locale this is
	#     equivalent to %I:%M:%S %p.
	#   %R
	#     The time in 24-hour notation (%H:%M). For a version including
	#     the seconds, see %T below.
	#   %s
	#     The number of seconds since the Epoch,
	#     1970-01-01 00:00:00 +0000 (UTC)
	#   %S
	#     The second as a decimal number (range 00 to 60). (The range is
	#     up to 60 to allow for occasional leap seconds.) (alt O)
	#   %t
	#     A tab character.
	#   %T
	#     The time in 24-hour notation (%H:%M:%S).
	#   %u
	#     The day of the week as a decimal, range 1 to 7, Monday being 1.
	#     See also %w. (alt O)
	#   %U
	#     The week number of the current year as a decimal number,
	#     range 00 to 53, starting with the first Sunday as the first
	#     day of week 01. See also %V and %W. (alt O)
	#   %V
	#     The ISO 8601 week number of the current year as a decimal number,
	#     range 01 to 53, where week 1 is the first week that has at least
	#     4 days in the new year. See also %U and %W. (alt O)
	#   %w
	#     The day of the week as a decimal, range 0 to 6, Sunday being 0.
	#     See also %u. (alt O)
	#   %W
	#     The week number of the current year as a decimal number,
	#     range 00 to 53, starting with the first Monday as the first day
	#     of week 01. (alt O)
	#   %x
	#     The preferred date representation for the current locale without
	#     the time. (alt E)
	#   %X
	#     The preferred time representation for the current locale without
	#     the date. (alt E)
	#   %y
	#     The year as a decimal number without a century (range 00 to 99).
	#     (alt E, alt O)
	#   %Y
	#     The year as a decimal number including the century. (alt E)
	#   %z
	#     The +hhmm or -hhmm numeric timezone (that is, the hour and minute
	#     offset from UTC).
	#   %Z
	#     The timezone name or abbreviation.
	#   %%
	#     A literal '%' character.
	# 
	# This configuration option has an automatic default value.
	# time_format = "%Y-%m-%d %T %z"

	# Configuration option report/devtypes_sort.
	# List of columns to sort by when reporting 'lvm devtypes' command.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_sort = "devtype_name"

	# Configuration option report/devtypes_cols.
	# List of columns to report for 'lvm devtypes' command.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_cols = "devtype_name,devtype_max_partitions,devtype_description"

	# Configuration option report/devtypes_cols_verbose.
	# List of columns to report for 'lvm devtypes' command in verbose mode.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_cols_verbose = "devtype_name,devtype_max_partitions,devtype_description"

	# Configuration option report/lvs_sort.
	# List of columns to sort by when reporting 'lvs' command.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_sort = "vg_name,lv_name"

	# Configuration option report/lvs_cols.
	# List of columns to report for 'lvs' command.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols = "lv_name,vg_name,lv_attr,lv_size,pool_lv,origin,data_percent,metadata_percent,move_pv,mirror_log,copy_percent,convert_lv"

	# Configuration option report/lvs_cols_verbose.
	# List of columns to report for 'lvs' command in verbose mode.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols_verbose = "lv_name,vg_name,seg_count,lv_attr,lv_size,lv_major,lv_minor,lv_kernel_major,lv_kernel_minor,pool_lv,origin,data_percent,metadata_percent,move_pv,copy_percent,mirror_log,convert_lv,lv_uuid,lv_profile"

	# Configuration option report/vgs_sort.
	# List of columns to sort by when reporting 'vgs' command.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_sort = "vg_name"

	# Configuration option report/vgs_cols.
	# List of columns to report for 'vgs' command.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols = "vg_name,pv_count,lv_count,snap_count,vg_attr,vg_size,vg_free"

	# Configuration option report/vgs_cols_verbose.
	# List of columns to report for 'vgs' command in verbose mode.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols_verbose = "vg_name,vg_attr,vg_extent_size,pv_count,lv_count,snap_count,vg_size,vg_free,vg_uuid,vg_profile"

	# Configuration option report/pvs_sort.
	# List of columns to sort by when reporting 'pvs' command.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_sort = "pv_name"

	# Configuration option report/pvs_cols.
	# List of columns to report for 'pvs' command.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free"

	# Configuration option report/pvs_cols_verbose.
	# List of columns to report for 'pvs' command in verbose mode.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols_verbose = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,dev_size,pv_uuid"

	# Configuration option report/segs_sort.
	# List of columns to sort by when reporting 'lvs --segments' command.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_sort = "vg_name,lv_name,seg_start"

	# Configuration option report/segs_cols.
	# List of columns to report for 'lvs --segments' command.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols = "lv_name,vg_name,lv_attr,stripes,segtype,seg_size"

	# Configuration option report/segs_cols_verbose.
	# List of columns to report for 'lvs --segments' command in verbose mode.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols_verbose = "lv_name,vg_name,lv_attr,seg_start,seg_size,stripes,segtype,stripesize,chunksize"

	# Configuration option report/pvsegs_sort.
	# List of columns to sort by when reporting 'pvs --segments' command.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_sort = "pv_name,pvseg_start"

	# Configuration option report/pvsegs_cols.
	# List of columns to sort by when reporting 'pvs --segments' command.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size"

	# Configuration option report/pvsegs_cols_verbose.
	# List of columns to sort by when reporting 'pvs --segments' command in verbose mode.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols_verbose = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size,lv_name,seg_start_pe,segtype,seg_pe_ranges"

	# Configuration option report/vgs_cols_full.
	# List of columns to report for lvm fullreport's 'vgs' subreport.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols_full = "vg_all"

	# Configuration option report/pvs_cols_full.
	# List of columns to report for lvm fullreport's 'vgs' subreport.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols_full = "pv_all"

	# Configuration option report/lvs_cols_full.
	# List of columns to report for lvm fullreport's 'lvs' subreport.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols_full = "lv_all"

	# Configuration option report/pvsegs_cols_full.
	# List of columns to report for lvm fullreport's 'pvseg' subreport.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols_full = "pvseg_all,pv_uuid,lv_uuid"

	# Configuration option report/segs_cols_full.
	# List of columns to report for lvm fullreport's 'seg' subreport.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols_full = "seg_all,lv_uuid"

	# Configuration option report/vgs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'vgs' subreport.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_sort_full = "vg_name"

	# Configuration option report/pvs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'vgs' subreport.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_sort_full = "pv_name"

	# Configuration option report/lvs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'lvs' subreport.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_sort_full = "vg_name,lv_name"

	# Configuration option report/pvsegs_sort_full.
	# List of columns to sort by when reporting for lvm fullreport's 'pvseg' subreport.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_sort_full = "pv_uuid,pvseg_start"

	# Configuration option report/segs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'seg' subreport.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_sort_full = "lv_uuid,seg_start"

	# Configuration option report/mark_hidden_devices.
	# Use brackets [] to mark hidden devices.
	# This configuration option has an automatic default value.
	# mark_hidden_devices = 1

	# Configuration option report/two_word_unknown_device.
	# Use the two words 'unknown device' in place of '[unknown]'.
	# This is displayed when the device for a PV is not known.
	# This configuration option has an automatic default value.
	# two_word_unknown_device = 0
# }

# Configuration section dmeventd.
# Settings for the LVM event daemon.
dmeventd {

	# Configuration option dmeventd/mirror_library.
	# The library dmeventd uses when monitoring a mirror device.
	# libdevmapper-event-lvm2mirror.so attempts to recover from
	# failures. It removes failed devices from a volume group and
	# reconfigures a mirror as necessary. If no mirror library is
	# provided, mirrors are not monitored through dmeventd.
	mirror_library = "libdevmapper-event-lvm2mirror.so"

	# Configuration option dmeventd/raid_library.
	# This configuration option has an automatic default value.
	# raid_library = "libdevmapper-event-lvm2raid.so"

	# Configuration option dmeventd/snapshot_library.
	# The library dmeventd uses when monitoring a snapshot device.
	# libdevmapper-event-lvm2snapshot.so monitors the filling of snapshots
	# and emits a warning through syslog when the usage exceeds 80%. The
	# warning is repeated when 85%, 90% and 95% of the snapshot is filled.
	snapshot_library = "libdevmapper-event-lvm2snapshot.so"

	# Configuration option dmeventd/thin_library.
	# The library dmeventd uses when monitoring a thin device.
	# libdevmapper-event-lvm2thin.so monitors the filling of a pool
	# and emits a warning through syslog when the usage exceeds 80%. The
	# warning is repeated when 85%, 90% and 95% of the pool is filled.
	thin_library = "libdevmapper-event-lvm2thin.so"

	# Configuration option dmeventd/executable.
	# The full path to the dmeventd binary.
	# This configuration option has an automatic default value.
	# executable = "/usr/sbin/dmeventd"
}

# Configuration section tags.
# Host tag settings.
# This configuration section has an automatic default value.
# tags {

	# Configuration option tags/hosttags.
	# Create a host tag using the machine name.
	# The machine name is nodename returned by uname(2).
	# This configuration option has an automatic default value.
	# hosttags = 0

	# Configuration section tags/<tag>.
	# Replace this subsection name with a custom tag name.
	# Multiple subsections like this can be created. The '@' prefix for
	# tags is optional. This subsection can contain host_list, which is a
	# list of machine names. If the name of the local machine is found in
	# host_list, then the name of this subsection is used as a tag and is
	# applied to the local machine as a 'host tag'. If this subsection is
	# empty (has no host_list), then the subsection name is always applied
	# as a 'host tag'.
	# 
	# Example
	# The host tag foo is given to all hosts, and the host tag
	# bar is given to the hosts named machine1 and machine2.
	# tags { foo { } bar { host_list = [ "machine1", "machine2" ] } }
	# 
	# This configuration section has variable name.
	# This configuration section has an automatic default value.
	# tag {

		# Configuration option tags/<tag>/host_list.
		# A list of machine names.
		# These machine names are compared to the nodename returned
		# by uname(2). If the local machine name matches an entry in
		# this list, the name of the subsection is applied to the
		# machine as a 'host tag'.
		# This configuration option does not have a default value defined.
	# }
# }

lv_name             - Name. LVs created for internal use are enclosed in brackets.[string]
lv_role             - LV role. [string list]
raid_mismatch_count - For RAID, number of mismatches found or repaired. [number]
copy_percent        - For RAID, mirrors and pvmove, current percentage in-sync. [percent]
lv_size             - Size of LV in current units. [size]
lv_time             - Creation time of the LV, if known [time]