From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Jonathan Steinert <hachi@kuiki.net>
Cc: linux-kernel@vger.kernel.org,
Johannes Niess <linux@johannes-niess.de>,
linux-usb@vger.kernel.org
Subject: Re: USB attached SATA disk idle spindown
Date: Tue, 24 Jun 2008 11:12:56 +0200 [thread overview]
Message-ID: <4860BA98.4070909@s5r6.in-berlin.de> (raw)
In-Reply-To: <4860B651.9090104@s5r6.in-berlin.de>
Stefan Richter wrote:
> Johannes recently informed me that he wrote a script which is used like
> a background daemon to stop idle USB disks. The script uses
> - "cat /sys/block/${device}/stat" to watch disk activity,
> - "sdparm -q -C stop /dev/${device}" to stop the motor after
> longer inactivity.
PS: I have seen START STOP UNIT with START=0 to be dangerous with some
FireWire firmwares. (Motor cannot be restarted after that anymore.)
Other firmwares ignore the START bit and look only at the POWER
CONDITIONS field. I expect various similar firmware quirks in USB land.
--
Stefan Richter
-=====-==--- -==- ==---
http://arcgraph.de/sr/
next prev parent reply other threads:[~2008-06-24 9:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-24 4:59 USB attached SATA disk idle spindown Jonathan Steinert
2008-06-24 8:54 ` Stefan Richter
2008-06-24 9:12 ` Stefan Richter [this message]
2008-07-18 1:15 ` Tejun Heo
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