[CentOS] Problem after last update

[Johnny Hughes]

On Mon, 2006-05-29 at 13:02 +0200, Dominik Składanowski wrote:
> Hello list.
> 
> Since morning I have an emergency. After last kernel update one of my
> servers didn't start. On display I see only "GRUB" :(
> I have 2 more servers based on CentOS too, but after the same update
> this servers works.
> 
> All servers have 2 HDs and works as software mirror.
> 
> I have started damaged machine using Knoppix and I can see partitions
> and data on both disks. Of course I have made a backup.
> 
> Anybody has the same problem? It can be hardware problem - HD diode
> light all the time. Or maybe something went wrong during update?
> 

It is very strange that grub (which was already installed and working)
would go bad during an upgrade.

I would boot from a CentOS-4.3 CD-1 and do this command at the isolinux
prompt:

linux rescue

If it mounts the install at /mnt/sysimage ... do this:

chroot /mnt/sysimage

Then I would follow this guide to make sure that grub is installed on
both hard drives and try rebooting:

 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=114690

(comment #7 should make you work ... assuming you have a software mirror
using sda/sdb or hda/hdb)

You may need to look at the file /boot/grub/Device.map to insure all the
drives are listed properly.

Thanks,
Johnny Hughes
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