linux-kernel - Re: 2.6.18-rc2, problem to wake up spinned down drive?

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Date:	Wed, 02 Aug 2006 03:23:06 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Harald Dunkel <harald.dunkel@...nline.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.18-rc2, problem to wake up spinned down drive?

Harald Dunkel wrote:
> Tejun Heo wrote:
>> Can you try the following instead of hdparm?
>>
>> echo 1 > /sys/bus/scsi/devices/1:0:0:0/power/state
>>
>> It will make libata involved in putting the disk to sleep and waking it
>> up, and, when waking, it will kick the drive in the ass by resetting the
>> channel.  Please try with the latest -rc kernel.
>>
> 
> Sorry to say, but this did not work:
> 
> # echo 1 > /sys/bus/scsi/devices/0:0:0:0/power/state
> bash: echo: write error: Invalid argument
> # ll !$
> ll /sys/bus/scsi/devices/0:0:0:0/power/state
> -rw-r--r-- 1 root root 0 Aug  1 20:00 /sys/bus/scsi/devices/0:0:0:0/power/state
> # cat !$
> cat /sys/bus/scsi/devices/0:0:0:0/power/state
> 0
> # uname -a
> Linux bugs 2.6.18-rc3 #2 PREEMPT Sun Jul 30 16:26:22 CEST 2006 i686 GNU/Linux

You probably should do 'echo -n 1', the parsing function is pretty picky.

-- 
tejun
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