mdadm: support external metadata arrays correctly (from debian)

[JK]

The mdadm package is currently seriously broken for Intel IMSM/"fakeraid" setups since mdmon is not part of the initrd (tested on quantal alpha3) and therefore only sets up a read-only array which breaks the boot process. If booted from a live cd and entered via a jail root, mdadm the devices can be properly mounted. Manually moving mdmon into the initrd allows for booting, but halting is more complex:

A patch has been proposed here [1] and I would suggest to also fix this problem ASAP, as this is a 100% show stopper.
Please refer to the discussion in [1] for further details.

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684708

[JK (j-c-k)]

I should add that this is a problem only if the system / is part of the array itself and therefore must be setup in initrd.

[JK (j-c-k)]

Also related to this is [1].

[1] http://comments.gmane.org/gmane.linux.raid/36852

[JK (j-c-k)]

Also [1].

[1] http://comments.gmane.org/gmane.linux.raid/36900

[JK (j-c-k)]

And it is not a duplicate of #957494

[JK (j-c-k)]

But maybe related/duplicate of #1030292

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.