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

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Date:	Tue, 01 Aug 2006 20:14:59 +0200
From:	Harald Dunkel <harald.dunkel@...nline.de>
To:	Tejun Heo <htejun@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.18-rc2, problem to wake up spinned down drive?

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


Regards

Harri



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