I've just rebuilt my server with a RAID 5 MD array consisting of 4 disks. I'd like to use hdparm to spin down the disks when the machine isn't in use but from reading the guide that comes with hdparm it talks about the possibility of corruption using the hdparm init script on disks in an MD array.

The only thing I'm setting is the spin down time and the guide was written in 2005 so may not take into consideration any changes that have happened since.

Can anyone see a problem with setting the spin down param in the hdparm config file and having it start on boot?