The /dev/md_dNN series of device names are mentioned near the end of the
mdadm(8) man-page, in the "DEVICE NAMES" section.

As it turns out, these devices aren't there now -- but they did exist on
my server before I upgraded it from Jaunty to Karmic.  (You'll just have
to take my word for this -- I can't revert my server to Jaunty in order
to create and produce the evidence.)  The /dev/md_dNN devices, as best I
can recall, were identical to the /dev/mdNN devices except that they
were mode 600 instead of 660.

The fact that these devices aren't on my server now suggests to me that
the problem I encountered here may not, in fact, be a "mountall" problem
at all, but a bug / feature of whatever part of Karmic is responsible
for setting up the RAID device names.  See bug #430542.

-- 
raid1 filesystems "cannot yet be mounted" after karmic upgrade
https://bugs.launchpad.net/bugs/486361
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