Hello,
as for understanding the grub disk and partition numbering scheme, you should read :
info grub
and more specifically the "Naming convention" paragraph.
Your issue is all about understanding this.
Hope this helps
---
Robert GRASSO ? System engineer
CEDRAT S.A.
15 Chemin de Malacher - Inovallée - 38246 MEYLAN cedex - FRANCE
Phone: +33 (0)4 76 90 50 45 - Fax: +33 (0)4 56 38 08 30
mailto:robert.grasso@xxxxxxxxxx - http://www.cedrat.com
> -----Message d'origine-----
> De : centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] De la part de Edward Diener
> Envoyé : 3 août 2010 06:08
> À : centos@xxxxxxxxxx
> Objet : Manually mounting partitions in "linux rescue" mode
>
> I boot from the installation DVD, with an already existing CentOS 5.5
> system on my hard disks. I have separate boot, root, and home
> partitions. I have moved the boot partition and now I need to
> re-initialize grub from rescue mode.
>
> Attempting to use 'rescue mode" to automatically mount my
> system under
> /mnt/sysimage eventally fails with an error message, which
> essentially
> says 'mount error' and nothing else. I am then put at a
> command prompt
> as root.
>
> So now I decide to manually mount my partitions at /mnt/sysimage and
> then do a chroot to /mnt/sysimage. This succeeds and when I
> look at my
> files they are there.
>
> I now try 'grub' and the 'grub' shell comes up. I now attempt
> the 'grub'
> command:
>
> root (hd0,9)
>
> only to be met with:
>
> Error 21: Selected disk does not exist.
>
> I do not know what this means and how I can correct it. Does anybody
> know what is going on ?
>
> One thing I am concerned about is that when I booted from the DVD and
> was eventually put at the command prompt, I saw there were devices in
> the /dev subdirectory but after I did the chroot, there were
> no devices
> in the new root's /dev subdirectory although when I had previosuly
> booted into CentOS 5.5 on my hard disk off course they were there.
>
> The other thing I noticed is that after the 'chroot' the
> 'mount' command
> showed only my root partition mounted on /dev/sdb8 where it actually
> exists ( along with sysfs and proc which I mounted from the
> old root ).
> But despite this there are no subdirectories under the new
> root's /dev.
>
> I am just trying to re-initialize 'grub' so I can boot my CentOS 5.5
> system again. There must be a way to successfully do this from the
> installation DVD. If somebody can give me the steps to
> manually mount my
> partitions and succeed it would be very much appreciated.
>
> _______________________________________________
> CentOS mailing list
> CentOS@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos
>
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
