During boot I was prompted with a warning, no valid partitions found on
/dev/sdc, hit ctrl-D to continue. Because this isn't a root partition,
I was able to continue booting with ctrl-D, which took me all the way to
the gdm login. I then dropped to a shell with ctrl-alt-F1. There were
no questions about degraded mode booting.
I fixed my problem with the following steps:
1. Stop the false md_d0 array
$ sudo mdadm --stop /dev/md_d0
2. Assemble the degraded md0 (only sdb was found) and mount it
$ sudo mdadm --assemble --scan
$ sudo mount /dev/lvm-raid/homelv /home
3. use mkconf to find the configuration option
$ sudo /usr/share/mdadm/mkconf
4. gedit /etc/mdadm/mdadm.conf to include the output from mkconf AND to use
only sdb
DEVICE /dev/sdb*
# definitions of existing MD arrays
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=6a291d6f:27049e9f:b95e1135:52246c3f
5. Reboot --> ubuntu found and mounted my array just fine (mount info
for LVM is my fstab)
6. Re-add sdc to md0
$ sudo mdadm /dev/md0 --re-add /dev/sdc1
7. Watch rebuild!
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid1 sdb1[0] sdc1[2]
976759936 blocks [2/1] [U_]
[==>..................] recovery = 14.2% (139109312/976759936)
finish=381.7min speed=36570K/sec
unused devices: <none>
I'm not sure why mdadm wanted to build the (incorrect) md_d0 and not the
(correct) md0.
--
Raid10 array not assembled at boot, all disks are marked as spare
https://bugs.launchpad.net/bugs/316670
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