LVM disk is not found on local disk /dev/sdb after reboot
Booted system into rescue and removed lvm from fstab to allow system to complete boot normally
LVM manager is not seeing the LVM information(metadata appears to be missing)
pvdisplay, vgdisplay and lvdisplay did not find anything
No changes were made to lvm to their knowledge.(Changes were made to the system on the backend. This change may not be apparent.)
LVM metadata restore fails with error "Device /dev/sdx not found (or ignored by filtering)."
- Red Hat Enterprise Linux 5, 6
- GPT parted used for partition larger than 2tb
- LVM created by gui
- System appeared to have lost lvm metadata.
# pvcreate --uuid P4ozw7-y8cJ-5Aw4-3RRc-KAXC-u6Fc-xQl66H /dev/sdb Device /dev/sdb not found (or ignored by filtering).
Verified that lvm.conf was not filtering the device.
fdisk -l gave the following:
#fdisk -l Disk /dev/sda: 146.1 GB, 146163105792 bytes 255 heads, 63 sectors/track, 17769 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 131 1052226 83 Linux /dev/sda2 132 784 5245222+ 83 Linux /dev/sda3 785 14374 109161675 83 Linux /dev/sda4 14375 17769 27270337+ 5 Extended /dev/sda5 14375 16985 20972826 83 Linux /dev/sda6 16986 17507 4192933+ 82 Linux swap / Solaris /dev/sda7 17508 17638 1052226 83 Linux /dev/sda8 17639 17769 1052226 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. WARNING: The size of this disk is 4.0 TB (3998614552576 bytes). DOS partition table format can not be used on drives for volumes larger than 2.2 TB (2199023255040 bytes). Use parted(1) and GUID partition table format (GPT). Disk /dev/sdb: 3998.6 GB, 3998614552576 bytes 255 heads, 63 sectors/track, 486137 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 267350 2147483647+ ee EFI GPT
Parted did not see sdb1 and could not remove it:
(parted) print all Model: DELL PERC 6/i (scsi) Disk /dev/sda: 146GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 1078MB 1077MB primary ext3 boot 2 1078MB 6449MB 5371MB primary ext3 3 6449MB 118GB 112GB primary ext3 4 118GB 146GB 27.9GB extended 5 118GB 140GB 21.5GB logical ext3 6 140GB 144GB 4294MB logical linux-swap 7 144GB 145GB 1077MB logical ext3 8 145GB 146GB 1077MB logical ext3 Model: DELL PERC 6/i (scsi) Disk /dev/sdb: 3999GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags Error: Unable to open /dev/md0 - unrecognised disk label.
Found that a GPT partition label was put on top of the lvm metadata.
- Duplicated the situation in house by creating lvm on /dev/sda in local environment then inserting GPT label.
- GPT label wrote over lvm metadata and caused the metadata to look like it was missing.
- When attempted to restore metadata it results in the device not being seen properly and restore fails.
- Must remove gpt label. There is no remove label in parted, only make label.
- Attempting to make a new label WILL destroy data on the device.
- To restore metadata without losing the contents of the lvm you must follow the steps following Resolution below.
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