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

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Message-ID: <4860BA98.4070909@s5r6.in-berlin.de>
Date:	Tue, 24 Jun 2008 11:12:56 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jonathan Steinert <hachi@...ki.net>
CC:	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:
> 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/
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