Comment 3 for bug 486361

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Rich Wales (richw) wrote : Re: raid1 filesystems "cannot yet be mounted" after karmic upgrade

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.