Recovering corrupted LVM data: No readable superblocks Post: 302902281

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Operating Systems Linux Recovering corrupted LVM data: No readable superblocks Post 302902281 by Aia on Monday 19th of May 2014 10:34:36 PM

05-19-2014

Registered User

Quote:

Originally Posted by dargason

Code:

$ sudo mke2fs -n /dev/sde2
mke2fs 1.42.7 (21-Jan-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
43376640 inodes, 173505280 blocks
8675264 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
5295 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
    102400000

Quote:

$ sudo mke2fs -n /dev/sde2

That should have not given you any superblock output if it were the partition for the logical volume /dev/VolGroup00/LogVol01

The output would had been more in the order of:
/dev/sde2 is apparently in use by the system, blah, blah
even if it is broken

Question? Are you sure that /dev/sde2 is the partition of the LVM?

Code:

dumpe2fs /dev/dm-1 | grep -i superblock
dumpe2fs /dev/mapper/VolGroup00-LogVol01 | grep -i superblock

Either of those two would output the proper superblocks if available, assuming for sure that /dev/dm-1 maps to the LVM.

What's the output of lsblk if available?

What's the output of pvdisplay?

Last edited by Aia; 05-19-2014 at 11:43 PM.. Reason: asking for pvdisplay

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LEARN ABOUT BSD

pvck

PVCK(8) 						      System Manager's Manual							   PVCK(8)

NAME
       pvck - check physical volume metadata

SYNOPSIS
       pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]

DESCRIPTION
       pvck checks physical volume LVM metadata for consistency.

OPTIONS
       See lvm for common options.

       --labelsector sector
	      By  default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0.  This parameter allows you to specify a
	      different starting sector for the scan and is useful for recovery situations.  For example, suppose the partition table is corrupted
	      or  lost	on  /dev/sda, but you suspect there was an LVM partition at approximately 100 MB.  This area of the disk may be scanned by
	      using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):

	      pvck --labelsector 204800 /dev/sda

	      Note that a script can be used with --labelsector to automate the process of finding LVM labels.

SEE ALSO
       lvm(8), pvcreate(8), pvscan(8) vgck(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)						   PVCK(8)