turning of hardisks, acpi, standby

[Michal Zeravik]

Hi,

what is (can do) acpi which comes with FC1 kernel?
Can I use that for turning computer into standby?
I noticed its possible to turn off ide harddisks,
but what about scsi disks? I have Fasttrack onboard
raid two disks connected as sda. Is it possible to turn
it off (after unmount) if system running on ide disk?

Michalz