Power savings on USB Hard drives
nate at root.org
Sun Dec 2 16:40:44 PST 2007
Kevin Oberman wrote:
>> Date: Sun, 02 Dec 2007 16:15:05 -0800
>> From: Nate Lawson <nate at root.org>
>> Sender: owner-freebsd-acpi at freebsd.org
>> Laurent LEVIER wrote:
>>> Hi Guys,
>>> I am using FreeBSD 6.2, soon 7.0 over a server and a laptop.
>>> I would like, on both configurations, to be able to have hard drive
>>> power savings as on internal IDE drives.
>>> At the moment, my external USB2 drive, when mounted but even not
>>> adresses, keeps running permanently despite it is just mounted for
>>> backups (no access out of backup times on sunday then).
>>> I digged on mailing lists, but cant find why the HD keep running.
>>> Can someone help?
>>> Thanks in advance
>> This is outside the realm of acpi. Have you tried the ataidle ported
>> application? It works for most internal drives but I'm not sure how it
>> would do over USB.
> Almost all external USB drives use umass and are not handled as ATA but
> as SCSI. As such, camcontrol is the tool that should probably be
> used, but I have no such devices and I don't know what the appropriate
> command might be.
> Asking on usb@ might provide the needed information.
Hmm, camcontrol stop/start used to work for Fibre Channel drives back in
2001. I have no idea what his usb interface might support though.
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