@Jeremy Foshee I ran my apport-collect on a Karmic server above. I had
the same workaround as one of the above commenters. I had a useless,
incomplete md_d0 listed in mdstat which had claimed three of the four
devices in my RAID. I stopped md_d0 and assembled the RAID again with
success.
$ cat /proc/mdstat
Personalities : [raid0]
md_d0 : inactive sde[3](S) sdc[1](S) sdd[2](S)
1321098048 blocks
unused devices: <none>
# mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde
mdadm: /dev/md0 has been started with 4 drives.
# cat /proc/mdstat
Personalities : [raid0]
md0 : active raid0 sdb[0] sde[3] sdd[2] sdc[1]
1761460224 blocks 1024k chunks
unused devices: <none>
** Tags added: karmic
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mdadm cannot assemble array as cannot open drive with O_EXCL
https://bugs.launchpad.net/bugs/27037
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