[arch-general] Installing to RAID .. cannot reboot

[Jason Ryan]

On 20/06/12 at 04:10pm, D. R. Evans wrote:
> D. R. Evans said the following at 06/20/2012 11:27 AM :
> > I have carefully followed the RAID instructions at:
> >   https://wiki.archlinux.org/index.php/Software_RAID_and_LVM#RAID_installation
> > 
> > I have not used LVM, just RAID. I have double-checked what I actually did, and
> > believe that I did exactly what the page tells me to do.
> > 
> > I have two identical drives, which I configured as RAID1.
> > 
> > At the conclusion of the installation, the instructions say:
> > 
> > ----
> > 
> > Once it is complete you can safely reboot your machine:
> > 
> > # reboot
> > 
> > ----
> > 
> > When I try to reboot, I receive the error message:
> >   ERROR: device /dev/md0 not found
> >   ERROR: unable to find root device /dev/md0
> > 
> > What do I have to do to get past this error?
> > 
> >   Doc
> > 
> > PS I tried to go back to the very beginning and walk through the instructions
> > again, but when I do that, when I reach this step:
> >   mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sd[cd]3
> > I am now informed that /dev/sdc3 is busy or unavailable.
> > 
> 
> Having spent a chunk of the day on this:
> 
> 1. I figured out how to avoid the "busy or unavailable" message: one issues
> the "mdadm --stop" command. One can then go back to the beginning and
> re-create the RAID array(s).
> 
> 2. So I meticulously started from scratch and, checking every command
> carefully, followed the instructions until I reached the point where they tell
> me to reboot.
> 
> 3. On reboot, I am in exactly the same situation as before: the system can't
> boot because it cannot find /dev/md0.
> 
> I therefore provisionally conclude that of the two possibilities:
>   α) I am making a mistake in following the instructions
>   β) The instructions contain a fatal error
> possibility β seems much the more likely. Most likely something is omitted, I
> think.
> 
I encountered this same issue at the start of the year: it is simply a matter of
completing the installation and chrooting in to install grub to both your
devices: http://jasonwryan.com/blog/2012/02/11/lvm/

I had thought I added a note to the wiki to that effect…

HTH

/J
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