Re: Upgrading a software RAID

[Maxime Boissonneault <maxime.boissonneault@usherbrooke.ca>]

>>> 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.
>>>       
>> RAID5 should not be missing, my /home was a RAID5.
>>     
> Yes, but /home is only mounted after it's accessed the root partition.
> It can then read any modules from the root partition, so the raid5
> module could still be missing from the initrd.  I suspect it'll have
> included it though.
>
>   
I did as you suggested above. I still get the same error message.
I have looked and did not find /etc/initramfs/modules. Instead, I found 
/etc/initramfs-tools/modules. In this file, there were a couple of 
comment lines explaining how to enable modules.
No modules were included.
I uncommented the "raid1" and added "raid5" and ran the procedure again.

Still getting the same problem.

Since the problem seems to be the boot, I will try to do a fresh 
install, then restore my backup while keeping the /boot from the fresh 
install.

Thanks,

Maxime