Can't Boot from /dev/md0

Can't Boot from /dev/md0

[Wiliam Colls]

Ubuntu 10.04 server, patched to date.

This machine is configured to boot from a Raid1 array. The partitions 
are located on /dev/sdb1 and /dev/sdc1, the boot partition is located on 
/dev/sda1. This configuation has worked well for some time, but after a 
recent shutdown for maintenance, which did not involve any of the 
partitions, the machine refuses to boot. The sequence hangs very shortly 
after startup, and eventually errors out with the message /dev/md0 not 
available. and drops into the Busybox shell.

After booting from a live rescue CD, and examining the partitions, they 
are all intact, and clean. They rescue CD was able to assemble the array.

Not sure where to go from here. Any Suggestions will be greatfully received.

William.

PS. I am sure that I read some recent discussion on a very similar 
problem, but I can't find that material now. If anyone has a link, it 
also be greatfully received.

-- 
I know that you believe that you understand what you think I said, but I 
am not sure that you realise that what you heard was not what I meant.

Re: Can't Boot from /dev/md0 - Solved

[Wiliam Colls]

On 03/11/2012 07:45 PM, Wiliam Colls wrote:
>
> Ubuntu 10.04 server, patched to date.
>
> This machine is configured to boot from a Raid1 array. The partitions
> are located on /dev/sdb1 and /dev/sdc1, the boot partition is located on
> /dev/sda1. This configuation has worked well for some time, but after a
> recent shutdown for maintenance, which did not involve any of the
> partitions, the machine refuses to boot. The sequence hangs very shortly
> after startup, and eventually errors out with the message /dev/md0 not
> available. and drops into the Busybox shell.
>
> After booting from a live rescue CD, and examining the partitions, they
> are all intact, and clean. They rescue CD was able to assemble the array.
>
> Not sure where to go from here. Any Suggestions will be greatfully
> received.
>
> William.
>
> PS. I am sure that I read some recent discussion on a very similar
> problem, but I can't find that material now. If anyone has a link, it
> also be greatfully received.
>

At least for now. After further investigation, I realised that the mdadm 
module was availalbe in the kernal, and I was able to assemble the array 
from the busybox prompt, and the boot will then continue normally. Still 
trying to determine what caused the problem and find a permanent fix.


-- 
I know that you believe that you understand what you think I said, but I 
am not sure that you realise that what you heard was not what I meant.