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

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

[Alan Stern]

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.

> 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.

I really don't know what's going on.  Maybe somebody on the linux-scsi
mailing list can explain this.

Alan Stern

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

[Pádraig Brady]

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

[Douglas Gilbert]

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

[Pádraig Brady]

On 22/07/11 18:38, Douglas Gilbert wrote:
> 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

y

> ? I'm guessing that neither the root file system nor swap
> are located on /dev/sda ?

correct

I now notice the `hdparm -s` option which might be applicable:

"Enable/disable the power-on in standby feature,
 if supported by the drive. VERY DANGEROUS"

Now I'm wary of enabling that because I do need
the drive enabled on first boot as the bios in this
dell laptop can only boot from a disk in this sata slot.
(I unmount and spin down after boot).

Seems like I might be left doing a spinup and spindown
at each resume.

cheers,
Pâdraig.
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