Just attempted this without much thinking:
http://pastebin.com/eWy2n0hq
Similar situation as reported by b-candler.
Upon reboot after that, the system root drive was /dev/sda ,/dev/sdb
unused.
If I try to force an mdadm assemble, it only pulls in /dev/sdb since sda is in
use by the operating system.
{{{
callaghan@callaghan-family:/dev/disk$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md126 : inactive sdb[0]
62520452 blocks super external:/md127/0
md127 : inactive sdb[0](S)
2260 blocks super external:imsm
}}}
I also tried to run "update-grub", but afterwards I can see that
/etc/grub/grub.cfg is now set to boot from /dev/sda (by-uuid), not any
mdadm.
Somehow need to get "update-grub" to reconfigure for mdadm/mdraid
support.
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https://bugs.launchpad.net/bugs/1028677
Title:
mdadm should be used for fakeraid (instead of dmraid)
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