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Old 11-16-2011, 09:39 AM   #1
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group descriptors corrupted!

Hi all, new user here. I did my due diligence and tried to find the answer prior to posting and have tried a few things but I am still broken. My situation: I have a storage device hooked up to a Ubuntu server via iSCSI. I had it all talking nicely and up and running about 2 weeks ago. Now the device will no longer mount.

root@Backup:~# mount /backups2
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so
The log..
root@Backup:~# dmesg | tail
[   39.995906] sd 2:0:0:1: [sdb] 18556198912 512-byte logical blocks: (9.50 TB/8.64 TiB)
[   39.998644] sd 2:0:0:1: [sdb] Write Protect is off
[   39.998654] sd 2:0:0:1: [sdb] Mode Sense: 97 00 00 08
[   40.000292] sd 2:0:0:1: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   40.003415]  sdb: sda1
[   40.018085] sd 2:0:0:0: [sda] Attached SCSI disk
[   40.026415]  unknown partition table
[   40.030556] sd 2:0:0:1: [sdb] Attached SCSI disk
[ 5715.244441] EXT4-fs (sda1): ext4_check_descriptors: Checksum for group 0 failed (51749!=0)
[ 5715.244453] EXT4-fs (sda1): group descriptors corrupted!
root@Backup:/# fdisk -ul /dev/sda1

Disk /dev/sda1: 9000.7 GB, 9000731017216 bytes
255 heads, 63 sectors/track, 1094276 cylinders, total 17579552768 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sda1 doesn't contain a valid partition table
Did some research and found this link and tried the following:

root@Backup:~# fsck /dev/sda1
fsck from util-linux-ng 2.17.2
e2fsck 1.41.11 (14-Mar-2010)
fsck.ext4: Group descriptors look bad... trying backup blocks...
fsck.ext4: Bad magic number in super-block when using the backup blocks
fsck.ext4: going back to original superblock
fsck.ext4: Device or resource busy while trying to open /dev/sda1
Filesystem mounted or opened exclusively by another program?

root@Backup:~# mke2fs -n /dev/sda1
mke2fs 1.41.11 (14-Mar-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
549363712 inodes, 2197444096 blocks
109872204 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
67061 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, 214990848, 512000000, 550731776, 644972544, 1934917632

root@Backup:~# e2fsck -b 1605632 /dev/sda1
/dev/sda1 contains a file system with errors, check forced.
Resize inode not valid.  Recreate<y>? yes

Pass 1: Checking inodes, blocks, and sizes
yyyInode 425 has a extra size (65535) which is invalid
Fix<y>? yes

Inode 426 is in use, but has dtime set.  Fix<y>? yes

Inode 426 has a extra size (18635) which is invalid
Fix<y>? yes

Inode 426 has compression flag set on filesystem without compression support.  Clear<y>? yes

Inode 426, i_size is 6414028916418760925, should be 0.  Fix<y>? yes

Inode 426, i_blocks is 6779278794416, should be 0.  Fix<y>? yes

Inode 427 is in use, but has dtime set.  Fix<y>? yes

Inode 427 has a extra size (42746) which is invalid
Fix<y>? yes

Inode 428 is in use, but has dtime set.  Fix<y>? yes

Inode 428 has imagic flag set.  Clear<y>? yes

Inode 428 has a extra size (11520) which is invalid
Fix<y>? yes

Inode 429 is in use, but has dtime set.  Fix<y>?
The above errors just went on and on.. Can anyone guide me in the next steps? I can provide more information as needed, please help!

Last edited by illuminate0; 11-16-2011 at 09:43 AM.
Old 11-16-2011, 06:52 PM   #2
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If you've re-created the FS and then fsck complains, could be a dying disk. Try this tool for analysis


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