Bug#947806: systemd doesn't like my raid, times out waiting for online partitions to come online, and can't continue boot

[Joshua Hudson]

Hey I got lucky with a google search and found what would be a dupe if
it were ever finished.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=805821

Somebody else managed to track the problem down.

For some reason systemd is only watching for /dev/dm-* rather than the
long dmraid device names. This is the equivalent of watching for
/dev/sda1 instead of the UUID.  Nikita Youshchenko:

> This way boot is ok (i.e. no delays and swap is enabled). But this is ugly and unreliable.

This does work when there's only one raid array in the OS, which is
most of the time. These are two real devices (no symlinks) with the
same major and minor numbers.