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

[Tejun Heo]

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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