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

From: Harald Dunkel
Date: Mon Aug 07 2006 - 14:41:06 EST

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?



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