Messages in this thread | | | Date | Fri, 18 Jul 2008 10:15:24 +0900 | From | Tejun Heo <> | Subject | Re: USB attached SATA disk idle spindown |
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Stefan Richter wrote: > (adding Cc: linux-usb and Johannes Niess) > > On 6/24/2008 6:59 AM, Jonathan Steinert wrote at LKML: >> Dear list, >> >> I am looking for what the current state of USB SATA timed spindown of- >> disks is ata this time. I've been reading documents and mailing lists- >> for every possible search I can dream up on the subject. Suggested- >> workable solutions include (but are probably not limited to): >> >> $ hdparm -S >> This seems to be the ATA way of telling a disk to spin down, and it >> works in some situations, but doesn't appear to work on USB attached >> disks under 2.6.25 >> >> $ sdparm >> This is suggested in a small number of locations. Most of which have >> examples on how to disable STANDBY on a handful of devices. I am >> unable to find any evidence that it can actually be used to enable >> power saving. > > I think either of these depend on specific support by the USB to SATA > bridge firmware. > > I hear some newer bridges and their firmwares implement ATA > pass-through. Would that help?
Yeah, ATA pass through is all that's needed for hdparm -S to work.
-- tejun
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