Power cycled it, it comes up and says those drives need rebuilding. Ok, sure. So it's doing that.
Meanwhile, I'm going to figure out which of the 1Us sitting around I can move it onto as a replacement.
Also thinking I should move Rigel, as the front fans are dying and making lots of noise about it, and Oort, which can't seem to bzip its backups without locking up.
Today is not going to be fun.