ACPI (?) Power management features - Query

[Kevin Oberman]

> Date: Sun, 30 Oct 2005 22:49:04 -0800
> From: Nate Lawson <nate at root.org>
> Sender: owner-freebsd-acpi at freebsd.org
> 
> Joe Holden wrote:
> > Firstly, Hello all!
> > 
> > Does FreeBSD (5.x, 7) support power management features such as powering 
> > down the hard disks when they aren't in use, such as windows is able to do?
> > 
> > If i 've missed something on the acpi www, or manual, feel free to 
> > abuse/flame/beat me with a stick.
> 
> man atacontrol

Feel free to point out that I am wrong, but I don't think atacontrol has
the capability to do that at this time. You can detach a disk, but this
will not power it down immediately. And it makes the disk disappear from
the system which, if it's mounted, is likely to induce a crash.

Matthew Dodd has a tool that does do this called atautil. Until
atacontrol or something else grows support for powering a disk down, I
think you will probably need it.

You can Google for it or look in the mail archives.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634