topic Re: how to bypass super block failure in Operating System - HP-UX

how to bypass super block failure

zenari — Mon, 25 Oct 2004 07:44:44 GMT

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

Re: how to bypass super block failure

Steven E. Protter — Mon, 25 Oct 2004 07:51:59 GMT

fsck -F -o full dev/vg03/lvol3

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

SEP

Re: how to bypass super block failure

Franky_1 — Mon, 25 Oct 2004 09:39:26 GMT

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

Re: how to bypass super block failure

Sundar_7 — Mon, 25 Oct 2004 12:21:30 GMT

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 ! :-)