Issue

• kdump fails to create a vmcore file on HP Serviceguard for Linux with the message "mount: can't find /mnt in /etc/fstab".
• When performing SysRq-C below log messages are observed in the console when kdump fails to create a vmcore file to the perticular directory (/var/crash) specified in /etc/kdump.conf which is on the Logical Volume on the internal disk device.

...skipping...

Making device-mapper control node
Scanning logical volumes
  Reading all physical volumes.  This may take a while...
  Found volume group "vg00" using metadata type lvm2
Activating logical volumes
  Not activating vg00/lv_root since it does not pass activation filter.
  Not activating vg00/lv_swap since it does not pass activation filter. 
  0 logical volume(s) in volume group "vg00" now active
Device /dev/mapper/vg00-lv_root not found
Command failed
Device /dev/mapper/vg00-lv_swap not found
Command failed
Free memory/Total memory (free %): 68208 / 113728 ( 59.9747 )
Saving to the local filesystem UUID=eacd3e24-4b55-4c88-a6b4-8291d9f1ec36
Usage: fsck.ext4 [-panyrcdfvtDFV] [-b superblock] [-B blocksize]
        [-I inode_buffer_blocks] [-P process_inode_size]
        [-l|-L bad_blocks_file] [-C fd] [-j external_journal]
        [-E extended-options] device

Emergency help:
 -p                   Automatic repair (no questions)
 -n                   Make no changes to the filesystem
 -y                   Assume "yes" to all questions
 -c                   Check for bad blocks and add them to the badblock list
 -f                   Force checking even if filesystem is marked clean
 -v                   Be verbose
 -b superblock        Use alternative superblock
 -B blocksize         Force blocksize when looking for superblock
 -j external_journal  Set location of the external journal
 -l bad_blocks_file   Add to badblocks list
 -L bad_blocks_file   Set badblocks list
mount: can't find /mnt in /etc/fstab
Restarting system.

...skipping...

• We have the following configurations for activation filter in /etc/lvm/lvm.conf.

# cat etc/lvm/lvm.conf | grep -v "#" | grep -v ^$
devices {
    dir = "/dev"
    scan = [ "/dev" ]
    obtain_device_list_from_udev = 1
    preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
    filter = [ "a/.*/" ]
    cache_dir = "/etc/lvm/cache"
    cache_file_prefix = ""
    write_cache_state = 1
    sysfs_scan = 1
    multipath_component_detection = 1
    md_component_detection = 1
    md_chunk_alignment = 1
    data_alignment_detection = 1
    data_alignment = 0
    data_alignment_offset_detection = 1
    ignore_suspended_devices = 0
    disable_after_error_count = 0
    require_restorefile_with_uuid = 1
    pv_min_size = 2048
    issue_discards = 0
}
allocation {

    maximise_cling = 1
    mirror_logs_require_separate_pvs = 0
    thin_pool_metadata_require_separate_pvs = 0
}
log {
    verbose = 0
    silent = 0
    syslog = 1
    overwrite = 0
    level = 0
    indent = 1
    command_names = 0
    prefix = "  "
}
backup {
    backup = 1
    backup_dir = "/etc/lvm/backup"
    archive = 1
    archive_dir = "/etc/lvm/archive"
    retain_min = 10
    retain_days = 30
}
shell {
    history_size = 100
}
global {
    umask = 077
    test = 0
    units = "h"
    si_unit_consistency = 1
    activation = 1
    proc = "/proc"
    locking_type = 1
    wait_for_locks = 1
    fallback_to_clustered_locking = 1
    fallback_to_local_locking = 1
    locking_dir = "/var/lock/lvm"
    prioritise_write_locks = 1
    abort_on_internal_errors = 0
    detect_internal_vg_cache_corruption = 0
    metadata_read_only = 0
    mirror_segtype_default = "mirror"
    use_lvmetad = 0
    thin_check_executable = "/usr/sbin/thin_check"
    thin_check_options = [ "-q" ]
}
activation {
    checks = 0
    udev_sync = 1
    udev_rules = 1
    verify_udev_operations = 0
    retry_deactivation = 1
    missing_stripe_filler = "error"
    use_linear_target = 1
    reserved_stack = 64
    reserved_memory = 8192
    process_priority = -18
    mirror_region_size = 512
    readahead = "auto"
    raid_fault_policy = "warn"
    mirror_log_fault_policy = "allocate"
    mirror_image_fault_policy = "remove"
    snapshot_autoextend_threshold = 100
    snapshot_autoextend_percent = 20
    thin_pool_autoextend_threshold = 100
    thin_pool_autoextend_percent = 20
    use_mlockall = 0
    monitoring = 1
    polling_interval = 15
}
dmeventd {
    mirror_library = "libdevmapper-event-lvm2mirror.so"
    snapshot_library = "libdevmapper-event-lvm2snapshot.so"
    thin_library = "libdevmapper-event-lvm2thin.so"
}
tags { hosttags = 1 }       <---
volume_list = [ "vg00" ]  <---

• The volume is private which is not shared between the cluster members thus we should have below line in lvm.conf as described in HP kbase article given here