Re: [RFC] Disable disk spinup during system resume

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On 21/07/11 17:49, Alan Stern wrote:
> On Thu, 21 Jul 2011, Pádraig Brady wrote:
> 
>> On 21/07/11 15:49, Alan Stern wrote:
>>> On Thu, 21 Jul 2011, Pádraig Brady wrote:
>>>
>>>> Hi,
>>>>
>>>> I have a secondary sata disk (sda)  in my system that
>>>> I would like not to spinup on resume.
>>
>>

> What happens if you kill all the running processes (or as many as 
> possible) before starting the suspend?
> 
> Also, how do you initiate the suspend?  Do you use a program, or do you 
> simply "echo mem >/sys/power/state"?

I just rebooted with init=/bin/sh and did

sdparm -r -C STOP /dev/sda
echo 0 > /sys/block/sda/device/scsi_disk/*/manage_start_stop
echo mem > /sys/power/state

When I hit the power button to resume
sda started spinning again :(
There kernel logs about sata ports starting up.
Maybe I need to put the drive into a different
sleep state or something to stop it starting.

cheers,
Pádraig.
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