Re: Disk spin down issue on shut down/suspend to disk

[Mark Lord <lkml@rtr.ca>]

Tejun Heo wrote:
> Michael Sedkowski wrote:
> > Dnia 07-08-2007, Wt o godzinie 03:43 +0900, Tejun Heo napisał(a):
> > > Does emergency unload count increase
> > > after each power down? 
> > I think I got it.
> > Using smartctl I've done a test and shut down, then repeted the test.
> > The only values that where diffrent are temperatures and
> > Hardware_ECC_Recovered which rised by 6 points.
> > However I have no idea which of those is the "emergency count"...
> > Full results in attachment.
> >
> > 192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       388
>
> I think this is the one.  You can test it by forcefully powering off the
> machine (press power button for several secs or disconnect AC and
> battery) and see whether the count increases.

FWIW, Tejun, with 2.6.22, my new Seagate 160GB SATA drive (notebook)
increments the "Power-Off_Retract_Count" on each suspend-to-RAM operation.
It does not do any double spin-up/spin-down things though.

What a mess.

-ml



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