Date: Sun, 20 Nov 2005 23:55:51 +0000
From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Alistair John Strachan <s0348365@sms.ed.ac.uk>,
       Marc Perkel <marc@perkel.com>, linux-kernel@vger.kernel.org
Subject: Re: Does Linux support powering down SATA drives?
Message-ID: <20051120235550.GI2556@spitz.ucw.cz>
References: <437F63C1.6010507@perkel.com> <1132426887.19692.11.camel@localhost.localdomain> <200511191900.12165.s0348365@sms.ed.ac.uk> <1132431907.19692.15.camel@localhost.localdomain>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1132431907.19692.15.camel@localhost.localdomain>
User-Agent: Mutt/1.3.27i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1166
Lines: 29

On Sat 19-11-05 20:25:07, Alan Cox wrote:
> On Sad, 2005-11-19 at 19:00 +0000, Alistair John Strachan wrote:
> > > SATA not yet, USB you could however.
> > 
> > Or PATA, of course. I switch off two of my HDs 4 minutes after last use with 
> > the commands:
> > 
> > hdparm -S 48 /dev/hde
> > hdparm -S 48 /dev/hdg
> > 
> > Isn't there a passthru patch in the works to let commands, such as the one 
> > required for suspend, through to a SATA device?
> 
> The latest kernels support command passthrough for SMART and the like
> but hdparm -S does not "switch off" anything. It may spin a drive down
> but the power consumption of 23 hours a day of "spun down" is
> significant, probably more than the hour it is powered up.

Really? Harddrive does not contain AC/DC converters, so situation should be slightly
better there, no?
								Pavel
-- 
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms         

-
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/