From: Stefan Seyfried <seife@suse.de>
To: Pavel Machek <pavel@suse.cz>
Cc: Alistair John Strachan <s0348365@sms.ed.ac.uk>,
Marc Perkel <marc@perkel.com>,
linux-kernel@vger.kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: Does Linux support powering down SATA drives?
Date: Mon, 21 Nov 2005 09:48:45 +0100 [thread overview]
Message-ID: <438189ED.3080305@suse.de> (raw)
In-Reply-To: <20051120235550.GI2556@spitz.ucw.cz>
Pavel Machek wrote:
> On Sat 19-11-05 20:25:07, Alan Cox wrote:
>> 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?
it is 7.5W vs. 0.9W (idle vs standby or sleep) on a Barracuda 120GB
7200rpm desktop drive. Notebook drives are doing better:
0.65W vs 0.25W (idle vs standby) or
0.65W vs 0.1W (idle vs sleep) on some Hitachi Travelstar.
Better than nothing, but pulling the plug is even better :-)
--
Stefan Seyfried \ "I didn't want to write for pay. I
QA / R&D Team Mobile Devices \ wanted to be paid for what I write."
SUSE LINUX Products GmbH, Nürnberg \ -- Leonard Cohen
next prev parent reply other threads:[~2005-11-21 8:49 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-19 17:41 Does Linux support powering down SATA drives? Marc Perkel
2005-11-19 19:01 ` Alan Cox
2005-11-19 19:00 ` Alistair John Strachan
2005-11-19 19:14 ` Marc Perkel
2005-11-19 19:20 ` USB storage -> Oops (2.6.14.2) JaniD++
2005-11-19 19:43 ` Does Linux support powering down SATA drives? Jeff Woods
2005-11-19 20:25 ` Alan Cox
2005-11-19 20:21 ` Alistair John Strachan
2005-11-19 20:30 ` Ondrej Zary
2005-11-19 21:49 ` Alan Cox
2005-11-19 21:20 ` Marc Perkel
2005-11-19 23:04 ` Alistair John Strachan
2005-11-20 7:22 ` asmith
2005-11-20 15:53 ` Marc Perkel
2005-11-20 16:04 ` Tomasz Torcz
2005-11-20 16:07 ` Marc Perkel
2005-11-20 16:17 ` Tomasz Torcz
2005-11-20 16:08 ` Alistair John Strachan
2005-11-21 16:21 ` Rob Landley
2005-11-21 16:51 ` Jeff Garzik
2005-11-21 17:34 ` Rob Landley
2005-11-21 17:14 ` Jason L Tibbitts III
2005-11-20 1:59 ` Rogério Brito
2005-11-20 2:09 ` resyncing broken software raid 1 Marc Perkel
2005-11-20 2:23 ` Kyle Moffett
2005-11-21 7:25 ` Jens Axboe
2005-11-20 23:55 ` Does Linux support powering down SATA drives? Pavel Machek
2005-11-21 8:48 ` Stefan Seyfried [this message]
2005-11-20 1:54 ` Rogério Brito
2005-11-20 0:57 ` James Courtier-Dutton
2005-11-21 15:43 ` Mark Lord
2005-11-21 15:49 ` Marc Perkel
-- strict thread matches above, loose matches on Subject: below --
2005-11-20 12:20 Douglas Gilbert
2005-11-21 0:27 Nicolas Mailhot
[not found] <5aF0K-82E-5@gated-at.bofh.it>
[not found] ` <5aH2x-2ub-5@gated-at.bofh.it>
[not found] ` <5aIrE-4BY-11@gated-at.bofh.it>
[not found] ` <5aK0x-6Wi-27@gated-at.bofh.it>
[not found] ` <5aROj-119-5@gated-at.bofh.it>
2005-11-21 3:39 ` Robert Hancock
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