Re: Western Digital GreenPower drives and Linux

[Christian Pernegger]

[ Keep me CCd on this, please. ]

>  Those fancy new WD GreenPower drives seem to be heavily suffering from the
>  rapidly increasing head load/unload problem. [...] I got one of them
>  (WD5000AACS) recently and to my horror [...]

I have the same disks, only with more warranty and supposedly
"enterprise" firmware (WD1000FYPS). The bug is the same, though, on
all four of them (~ 9 cycles /hour):

  9 Power_On_Hours          0x0032   099   099   000    Old_age
Always       -       917
193 Load_Cycle_Count        0x0032   198   198   000    Old_age
Always       -       8025

  9 Power_On_Hours          0x0032   099   099   000    Old_age
Always       -       906
193 Load_Cycle_Count        0x0032   198   198   000    Old_age
Always       -       7908

  9 Power_On_Hours          0x0032   099   099   000    Old_age
Always       -       907
193 Load_Cycle_Count        0x0032   198   198   000    Old_age
Always       -       8051

  9 Power_On_Hours          0x0032   099   099   000    Old_age
Always       -       918
193 Load_Cycle_Count        0x0032   198   198   000    Old_age
Always       -       7869

>  I got the _DOS_ utility from WD which issues vendor specific commands to
>  control that feature.

Have they confirmed it's a bug? I have no idea how often the disks
should do that.

>  [...] With it the unload feature can be either disabled or timer set from
>  100ms to 25.5 seconds. But obviously I can't try it...

Why? Using a DOS boot disk once would not be that bad as a workaround,
would it? Or is the setting not persistent? Either way I'd prefer to
be able to leave the feature on (in usable form), eventually.

The bigger question is - why the rapid loads / unloads? In my case the
disks are idle hours at a time. No system files on there, just bulk
data. Does / could the controller (sata_sil24 in my case) have any
influence on this kind of power management?

Thanks,

C.
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