Re: [linux-pm] [RFC] Disable disk spinup during system resume

[Douglas Gilbert <dgilbert@interlog.com>]

On 11-07-22 11:50 AM, Pádraig Brady wrote:
> On 22/07/11 15:05, Alan Stern wrote:
>> On Fri, 22 Jul 2011, Pádraig Brady wrote:
>>
>>> 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 :(
>>
>> I have no idea why.  Unless maybe the BIOS started the drive.
>>
>> Here's another test you can try.  Before starting the suspend, make
>> sure no filesystems are mounted on sda and do:
>>
>> 	echo scsi remove-single-device 0 0 0 0>/proc/scsi/scsi
>>
>> (replace the "0 0 0 0" with the appropriate Host, Channel, ID, and LUN
>> values for your sda drive).  This will erase all knowledge of that
>> drive from the kernel.  If it still spins up during resume, you can be
>> sure the kernel isn't responsible.
>
> drive still spins up on resume.

Did the disk (/dev/sda) spin down after
    sdparm -r -C STOP /dev/sda
? I'm guessing that neither the root file system nor swap
are located on /dev/sda ?

Doug Gilbert
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