I've forgotten about how this works exactly, but if you take a look in:
/usr/share/initramfs-tools/scripts/local
If you look for the comment
# We've given up, but we'll let the user fix matters if they canomment:
The bit inside the while loop with the panic is the part that gets
executed if there is a timeout trying to mount root. Here's what I put
in my Fiesty version right before that comment.
if [ ! -e "${ROOT}" ]; then
# Try mdadm in degraded mode in case some drive has failed.
/scripts/local-top/mdadm
fi
This doesn't work anymore because of the changes to Gutsy. You could
just try putting 'mdadm --assemble --scan' there, but that probably
won't work. Everything is a little tricky in these scripts because they
run before root is mounted, so stuff doesn't always work as you would
expect.
Also, you can't just modify these scripts. After you change them, you
have to use 'mkinitramfs' to generate the image that contains these
scripts that is used during the boot up. I'd put in instructions, but
I've forgotten how to do it myself.
--
cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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