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

["Pádraig Brady" <P@draigBrady.com>]

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.

cheers,
Pádraig.
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html