BAD SUPER BLOCK: MAGIC NUMBER WRONG

[Tanja_4]

Hi again.
I found the Hp-ux recovery cd and I try to use it to try to recover our system from 9245xb Pdt
VFS_MOUNTROOT failed.
But when recovery program reach the fsck utility, I get this message BAD SUPER BLOCK: MAGIC NUMBER WRONG /dev/rdsk/c0t8d0s1lvm and the utility stop saying to try the -b option.
The same message trying the -b option.
Also because of my low skill on hp-ux 10.20, now I don't what to try.
Any help ? Thanks a lot.
Hp-ux 10.20 running on an Hp 9000 d270, two 4.3 gb differential scsi drive.
Tanja

[Suraj Singh_1]

Hi,

A list of alternate super blocks is stored in /etc/sbtab.

If somehow you have the contents of this file, u can use -b option to specify alternate super-block and then should be able to complete fsck.

Rgds

[T G Manikandan]

check /etc/sbtab file for the alternate super block information

use

#fsck -b

[Tanja_4]

Thanks, but my question is: can I access the /etc/sbtab file booting from the recovery Cd since I cannot boot from hard disk ?
Or I have manually to mount the hard disk ?

Tanja

[Stephen Keane]

try 16, 8240 or 16464 as they are common values.

[melvyn burnard]

There is normally always a spare SuperBlock at address 16, so try typing 16 in with the -b option.

[Tanja_4]

Ok, so I will try
#fsck -b 16 .
The value for is /dev/rdsk/c0t8d0s1lvm ?
the command line # is the same of recovery # ?

Always thanks a lot.

Tanja