Hi,
from what I have gathered now, two things are generally expected (as in
just works on in other distros) but is missing functionality in ubuntu:
1) No handling of raid degration during boot for non-root filesystems (at all).
(Boot simply stops at a recovery console)
2) Only limited and bugy handling of raid degration for the rootfs.
(Working only for plain no lvm/crypt md's and after applying a fix from
the 9.10 release notes.)
The other points on https://wiki.ubuntu.com/ReliableRaid are bugs that
hold back reaching the design goals that are associated with the
original move to use a hotplug (udev) setup in ubuntu.
--
server guide: warn about using ubuntu with raid or provide reliable raid config
https://bugs.launchpad.net/bugs/496478
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