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Recovering corrupted vmdk disk

A raid5 storage crashed leaving all of the vms unable to boot.

I ssh'ed into the host and ran the following commands to recover what ever I could after trying a number of other things.

# vmkfstools --fix check disk-s001.vmdk
# vmkfstools --fix repair disk-s001.vmdk

Created new disk image from old one

# vmkfstools -i disk-s001.vmdk disk-new.vmdk

Now trying to add these disks to an existing vm as a second disk but having all kinds of problems. I was able to recover one disk by using fsck but it basically broke everything down into thousands of small directories making recovery useless. Now I'm trying to find a way of mounting the disks without having to rebuild this time.

Why you ask? This is why.
Once installed as a second disk on a test vm, I only see what appears to be 'Journal superblock magic number invalid!' leading me to believe (HOPE) that I just need to fix the superblock and might be able to mount the disk.

Any way of recovering the data that you know of?

# dumpe2fs /dev/sdb1
dumpe2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          d1fd0004-ec67-4e4e-b9c5-6492cbbb039c
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              786432
Block count:              3145724
Reserved block count:     157286
Free blocks:              2772463
Free inodes:              785446
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      767
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Tue Apr 22 12:19:19 2014
Last mount time:          Thu Aug  6 13:15:59 2015
Last write time:          Thu Aug  6 13:15:59 2015
Mount count:              35
Maximum mount count:      38
Last checked:             Tue Apr 22 12:19:19 2014
Check interval:           15552000 (6 months)
Next check after:         Sun Oct 19 12:19:19 2014
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      d5ff043a-e227-4a0f-b239-e1ac8c51f98a
Journal backup:           inode blocks
Journal superblock magic number invalid!

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Avatar of kiwistag
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If you have a support licence/subscription with VMWare, maybe raise a job with them.
Sometimes they're good, other times you get the feeling that a fault will be an 'around to it'. fix.
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No support, it's ESXi.
try "e2fsck -y" to repair the super block.
That will cause it to be fully recovered and ending up with hundreds/thousands of sub directories.
Avatar of Joseph Gan
Find out where is the superblock
# mke2fs -n /dev/xxxx

You should see a list of superblock backups

Restore the superblock from the backup
# e2fsck -b block_number /dev/xxxx
How do I know which one is good? What if I use one that's corrupted or does the tool know not to list a corrupted one?

# mke2fs -n /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
786432 inodes, 3145724 blocks
157286 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=3221225472
96 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
The command will tell whether it was corrupted or not, the one above looks good.
So, pick any of these, such as the first, 32768

# e2fsck -b 32768 /dev/sdb1
e2fsck 1.41.12 (17-May-2010)
Superblock has an invalid journal (inode 8).

Same thing. Running this tries to fix the entire disk.
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Joseph Gan
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