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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