On Sat May 30, 2009 at 02:11:52PM -0400, Maxime Boissonneault wrote:
> Ok. This is the configuration I had :
> /dev/md1 was a RAID0 composed of /dev/sda2, /dev/sdb2 and /dev/sdc2
>
> I did this :
> mdadm --stop /dev/md1
> mdadm --zero-superblock /dev/sda2
> mdadm --zero-superblock /dev/sdb2
> mdadm --zero-superblock /dev/sdc2
>
> and then this :
> mdadm --create --verbose /dev/md1 --level=5 --raid-devices=3 /dev/sda2
> /dev/sdb2 /dev/sdc2
>
> I used the rescue mode from an alternate CD (hardy 8.04.2) to format
> /dev/md1 as ext3. Then, I restored the backup and updated the
> /etc/mdadm/mdadm.conf file with the output of mdadm --detail --scan.
>
> Now, GRUB loads (it was on /dev/md0 which is a RAID1 composed of sd*1), and
> it tries to load Ubuntu, but it just won't load.
>
How far does it get with booting? It should boot the kernel but fail to
find the root filesystem (if it's an initrd problem anyway).
> You said that I would have to edit initrd... what is that and what do I
> have to change in it ?
>
The initrd is the ramdisk which the kernel boots to first, containing
the various modules and utility programs (like mdadm) needed to access
the main root filesytem. A quick search suggests that you need to run
'update-initramfs -u' on Ubuntu. You'll need to boot off the CD and
chroot onto the new array first though - something like:
- Boot off CD
- Assemble the RAID arrays
- Create a mount point for the new array (mkdir /mnt/newroot)
- Mount the root filesystem (mount /dev/md1 /mnt/newroot)
- Mount the proc filesystem (mount -o bind /proc /mnt/newroot/proc)
- Mount the sys filesystem (mount -o bind /sys /mnt/newroot/sys)
- Mount the dev filesystem (mount -o bind /dev /mnt/newroot/dev)
- Chroot to the new array (chroot /mnt/newroot /bin/bash)
- Mount the boot filesystem (mount /boot)
- Update the initramfs (update-initramfs -u)
- Unmount the boot filesystem (umount /boot)
- Exit the chroot (exit)
- Unmount the dev filesystem (umount /mnt/newroot/dev)
- Unmount the sys filesystem (umount /mnt/newroot/sys)
- Unmount the proc filesystem (umount /mnt/newroot/proc)
- Unmount the root filesystem (umount /mnt/newroot)
- Reboot
That's just from memory though, so watch out for any warnings/errors.
The other issue you _may_ have is the raid5 module missing from the
initrd - you'd best check that raid5 is listed in
/etc/initramfs/modules.
HTH,
Robin
--
___
( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
// !! | "He fallen in de water !!" |
Attachment:
pgpzT6q2BIiDx.pgp
Description: PGP signature
