Date: Sun, 02 Dec 2007 16:40:38 -0800 From: Nate Lawson <nate@root.org> To: Kevin Oberman <oberman@es.net> Cc: freebsd-acpi@freebsd.org Subject: Re: Power savings on USB Hard drives Message-ID: <47535086.8060204@root.org> In-Reply-To: <20071203002752.ADB184500E@ptavv.es.net> References: <20071203002752.ADB184500E@ptavv.es.net>
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Kevin Oberman wrote: >> Date: Sun, 02 Dec 2007 16:15:05 -0800 >> From: Nate Lawson <nate@root.org> >> Sender: owner-freebsd-acpi@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 >>> >>> Brgrds >> 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. -- Nate
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