I've also tried the laptop mode tools. Somehow this seemed to spindown the 
disks while MD had not flushed its writes to the disks, or it did something 
else so I ended up with 4 disks and no array. After some crash recovery I 
managed to get a degraded array back with 3 out of the 4 disks.
I got the 4th disk added to the array, and after some hours array was rebuild. 
It kinda takes the fun out of testing with live data on the disks. There's a 
bit over 1 Tbyte of data on the array, and backup / restoring is kinda time 
consuming.

@pjotr12345, I did not get my disks to spindown from commandline with
hdparm -Y /dev/sd[a-d]. I did see "issueing sleep command" for all four
disks, but straight after a hdparm -C /dev/sd[a-d] all disks show
idle/running instead of standby.

-- 
[Lucid] hdparm.conf change doesn't have effect
https://bugs.launchpad.net/bugs/568120
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