I have just had a problem with my Ubuntu 7.1 machine not booting again. Both
disks of the RAID1 set (and the spare) seemed to be fine, but the system
wouldn't boot. I just ended up at the Busybox prompt. I was able to get it
going again using the following commands:
"mdadm --assemble /dev/md0 --super-minor=0 -f /dev/sda1 /dev/sdb1
/dev/sdc1"
"mdadm --assemble /dev/md1 --super-minor=1 -f /dev/sda2 /dev/sdb2
/dev/sdc2"
I have another RAID set on this machine /dev/md2 and it was fine.
A little research helped me discover a possible reason. I used the following
commands to create the mdadm.conf file:
"sudo echo "DEVICE partitions" > /etc/mdadm/mdadm.conf"
"sudo mdadm --detail --scan >> /etc/mdadm/mdadm.conf"
It may have been the first command which created the problem I had as I had
modified some partitions just before I had the boot problem. I have changed my
mdadm.conf to that created by the following command:
"mdadm --detail --scan --verbose > /etc/mdadm.conf"
Time will tell whether this solves the problem long term.
Bill, have a look at my post of 29 Dec 07. I think that tells you all
you need to know. Having a look your other post, it seems that you have
done everything else you need to do. I have put together a complete set
of instructions for creating the bootable RAID set. I can post these if
you need them.
Cheers,
Ken
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cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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