[Bug 120375] Re: cannot boot raid1 with only one disk

[Tapani Rantakokko]

Ok, I'm answering myself: there is a workaround for getting it to work
with LUKS encryption. You can run "sudo dpkg-reconfigure mdadm" and
enable automatic startup with degraded RAID array if you want, or watch
the screen and be quick enough to answer "Yes" when asked to start
degraded. Nevertheless, you need to wait again until you're dropped to
BusyBox. Then do this:

# to enter the passphrase. md1 and the md1_crypt are the same values
# you had to put in /target/etc/crypttab at the end of the install
cryptsetup luksOpen /dev/md1 md1_crypt

# (type your LUKS password, as requested)

# continue to boot!
<hit CTRL+D>

I found the instructions from here:
http://ubuntuforums.org/archive/index.php/t-524513.html

Now, if only someone could give a hint on how to make this automatic, so
that there would be no need to write anything. It is ok to wait a few
minutes, though.

Nevertheless, I'm pretty happy now that I can use "--no-degraded"
parameter in 85-mdadm.rules, yet get the system up in case a disk fails.
In the rare case of an actual disk failure, writing a one-liner can be
tolerated. Thank you everyone who have worked with this issue and helped
to get it solved in Hardy.

-- 
cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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