Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755285AbYGSKWz (ORCPT ); Sat, 19 Jul 2008 06:22:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754213AbYGSKWG (ORCPT ); Sat, 19 Jul 2008 06:22:06 -0400 Received: from hera.kernel.org ([140.211.167.34]:51418 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754165AbYGSKWE (ORCPT ); Sat, 19 Jul 2008 06:22:04 -0400 Message-ID: <487FEEAC.9040809@kernel.org> Date: Fri, 18 Jul 2008 10:15:24 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.12 (X11/20071114) MIME-Version: 1.0 To: Stefan Richter CC: Jonathan Steinert , linux-kernel@vger.kernel.org, Johannes Niess , linux-usb@vger.kernel.org Subject: Re: USB attached SATA disk idle spindown References: <20080624045953.GA24600@miyako.sixapart.com> <4860B651.9090104@s5r6.in-berlin.de> In-Reply-To: <4860B651.9090104@s5r6.in-berlin.de> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Sat, 19 Jul 2008 10:21:46 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1397 Lines: 37 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/