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Full Discussion: Recovering corrupted LVM data: No readable superblocks
Operating Systems Linux Recovering corrupted LVM data: No readable superblocks Post 302902423 by dargason on Tuesday 20th of May 2014 01:06:16 PM
Old 05-20-2014
Hi Aia, thanks a bunch for your response.

/dev/sde2 is the LVM partition I am interested in. Running mke2fs on /dev/VolGroup00/LogVol01 explicitly gives me the same thing.

Code:
$ sudo mke2fs -n /dev/VolGroup00/LogVol01
[sudo] password for ds229: 
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
38404096 inodes, 153600000 blocks
7680000 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
4688 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

Both dumpe2fs commands are not able to read anything
Code:
$ sudo dumpe2fs /dev/dm-1 | grep -i superblock
dumpe2fs 1.42.7 (21-Jan-2013)
dumpe2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/dm-1
Couldn't find valid filesystem superblock.

$ sudo dumpe2fs /dev/mapper/VolGroup00-LogVol01 | grep -i superblock
dumpe2fs 1.42.7 (21-Jan-2013)
dumpe2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/mapper/VolGroup00-LogVol01
Couldn't find valid filesystem superblock.

And here is the output for lsblk and pvdisplay

Code:
$ sudo lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 596.2G  0 disk 
├─sda1   8:1    0 196.1M  0 part 
└─sda2   8:2    0   596G  0 part 
sdb      8:16   0 931.5G  0 disk 
├─sdb1   8:17   0   500M  0 part /boot
├─sdb2   8:18   0 742.2G  0 part /home
├─sdb3   8:19   0  58.6G  0 part /
├─sdb4   8:20   0     1K  0 part 
├─sdb5   8:21   0  48.8G  0 part /usr/swr
├─sdb6   8:22   0  19.5G  0 part /var
├─sdb7   8:23   0  11.7G  0 part [SWAP]
└─sdb8   8:24   0  29.3G  0 part 
sde      8:64   0 698.7G  0 disk 
├─sde1   8:65   0     1G  0 part /run/media/marsluo/e08527a9-c875-4cc4-b83c-1158e07640c6
├─sde2   8:66   0 661.9G  0 part 
├─sde3   8:67   0    16G  0 part 
├─sde4   8:68   0     1K  0 part 
└─sde5   8:69   0    10G  0 part /run/media/marsluo/9c758ac5-3a6d-4181-a401-9dce5175144c
sr0     11:0    1  1024M  0 rom  
sr1     11:1    1  1024M  0 rom  
$ sudo pvdisplay
  --- Physical volume ---
  PV Name               /dev/sde2
  VG Name               VolGroup00
  PV Size               661.87 GiB / not usable 27.00 MiB
  Allocatable           yes 
  PE Size               32.00 MiB
  Total PE              21179
  Free PE               554
  Allocated PE          20625
  PV UUID               sqJHbZ-Udp4-OtHq-GQ38-Rkff-TSHQ-unS59g

FYI, the drive is currently sitting in a FC19 machine and was partitioned/written in a different Fedora box (18 or 19, I forget).
 

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LEARN ABOUT NETBSD

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 2.02.44-cvs (02-17-09)						   PVCK(8)
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