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

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Message-ID: <44D789BA.4010206@t-online.de>
Date:	Mon, 07 Aug 2006 20:43:06 +0200
From:	Harald Dunkel <harald.dunkel@...nline.de>
To:	Tejun Heo <htejun@...il.com>
CC:	Pavel Machek <pavel@....cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	davidsen@....com
Subject: Re: 2.6.18-rc2, problem to wake up spinned down drive?

Tejun Heo wrote:
> Pavel Machek wrote:
>>> echo 1 > /sys/bus/scsi/devices/1:0:0:0/power/state
>>
>> Really? I thought power/state takes 0/3 (for D0 and D3)
> 
> Yes, of course.  My mistake.  Sorry about the confusion.  The correct
> command is 'echo -n 3 > /sys/bus/scsi/devices/x:y:z:w/power/state'.
> 

(Sure?  :-)

Now this did not work at all. The '-n 3' was probably
correct, but when I tried to access the disk, then it
did not spin up again (I waited for 5 minutes). There
was no message on the console, either.

But I could not reproduce this problem.

How do I monitor that the disk spins down and up?


Regards

Harri



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