I have Linux server with a 3ware 9550SX SATA RAID controller with several disks attached. One of them is a 2TB disk that I'm using for backups. It's a normal desktop disk (i.e. not for 24/7) and I want that disk to spin down when it's idle for 20 minutes. Unfortunately,
hdparm -S 240 on the device gives me
HDIO_DRIVE_CMD(setidl1) failed: Invalid argument.
Is there another way to spin down the drive or do I really have to walk down in the cellar, delete the unit, pull it out of the bay, after every incremental backup?