how to bypass super block failure

[zenari]

Hi,

I want to retrieve data on an old mirrored disk but fsck returns a failure on super-block for one of the logical volume(/dev/vg03/lvol3).
Can I bypass this superblock failure without erasing all data on this disk ?
Thanks,
Olivier

[Steven E. Protter]

fsck -F -o full dev/vg03/lvol3

If that does not work there really is little hope of recovering the data.

SEP

[Franky_1]

Hi,

if it's a hfs FS you could specify an alternate super-block using "-b" option (normally 16)
You can look for alternate super-blocks in /var/adm/sbtab

See fsck_hfs for more details

Regards

Franky

[Sundar_7 · Accepted solution]

If it is a HFS filesystem you can mention the alternate superblock number using the -b option. But I seriously doubt if you stil use HFS filesystem :-)

With JFS, you will have to fun a FULL check on the FS and hope it fixes the problem

# fsck -F vxfs -o full -y /dev/vg03/rlvol3

If this doesnt help, only fsdb experts can help ! :-)