linux-kernel - Re: USB attached SATA disk idle spindown

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Message-ID: <487FEEAC.9040809@kernel.org>
Date:	Fri, 18 Jul 2008 10:15:24 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	Jonathan Steinert <hachi@...ki.net>, linux-kernel@...r.kernel.org,
	Johannes Niess <linux@...annes-niess.de>,
	linux-usb@...r.kernel.org
Subject: Re: USB attached SATA disk idle spindown

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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