topic Re: Corrupted LABEL file in Operating System - HP-UX

Corrupted LABEL file

Ismail Azad — Tue, 09 Nov 2010 21:27:48 GMT

Hi experts,

There is a typical standard procedure for repairing a corrupted label file. But why do I execute the following command as part of the process :-
chroot /ROOT /sbin/sh

Thanx gurus

Re: Corrupted LABEL file

Viktor Balogh — Wed, 10 Nov 2010 13:27:22 GMT

Hi,

I don't know what your procedure is, but can explain the functionality of the chroot command:

# chroot /ROOT /sbin/sh

the above command starts a new sh shell, and in this shell the new root directory will be your previous /ROOT directory. From that shell, you see only the descendant directories from under /ROOT.

e.g.:

A file in your initial shell under /ROOT/newfile will be visible in sh under /newfile.

I hope you get it. If not, you can read some more info from the man page of chroot:

# man 1m chroot

Regards,
Viktor

Re: Corrupted LABEL file

Torsten. — Wed, 10 Nov 2010 21:27:49 GMT

You usually do this when running a recovery shell - this is not really related to a corrupted LABEL file!

The LABEL file is written by using the

lvlnboot -r|-b|-s|-d|-R

commands!

Re: Corrupted LABEL file

Anoop Sivan — Thu, 11 Nov 2010 01:32:15 GMT

Hello Ismael,
When a normal boot is not successful, we need to booting from some recovery medium(IUX- server/CD)in to a recovery shell.A Program called loadfile which is run from the recovery medium loads essential files in to a RAM based file system (8MB). So when we enter chroot /ROOT /sbin/sh makes the /ROOT file system your root file system.

Re: Corrupted LABEL file

Ismail Azad — Thu, 11 Nov 2010 07:21:24 GMT

Torsten,

I am aware with the commands for lvlnboot to update the pointers for primary swap, boot and root logical volumes. And yes I am in the recovery shell and I was talking bout repairing a corrupted LABEL file from recovery shell because my system does not boot!! Thanks anyways...

Re: Corrupted LABEL file

Torsten. — Thu, 11 Nov 2010 17:30:35 GMT

>> why do I execute the following command as part of the process :-
chroot /ROOT /sbin/sh

Well, during recovery you boot the system NOT from the boot disk, but from a RAM disk. With "chroot" you try to bring the original boot disk back into place as root disk.

Re: Corrupted LABEL file

Ismail Azad — Thu, 11 Nov 2010 18:42:43 GMT

Yes that's it torsten. So the RAM based file system is not only used for Ignite. It's also when u are booting from a CD into recovery shell. Nice to know.Anoop - (info was useful). Thanks

Regards

Re: Corrupted LABEL file

Ismail Azad — Thu, 11 Nov 2010 21:37:28 GMT

Thank you everyone.