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Re: hard disk power down
- From: David Zeuthen <david fubar dk>
- To: Richard Hughes <hughsient gmail com>
- Cc: Development discussions related to Fedora Core <fedora-devel-list redhat com>, richard hughsie com
- Subject: Re: hard disk power down
- Date: Mon, 21 May 2007 15:55:43 -0400
Hi,
Sorry for the lag - been traveling,
On Mon, 2007-05-14 at 13:18 +0100, Richard Hughes wrote:
> On Mon, 2007-05-14 at 12:56 +0100, Andy Green wrote:
> >
> > If in reality you expected the drive to last 5 years and it was in use
> > half that time, spreading the budget of 300,000 starts and stops over
> > that period looks like you can afford to do something like 6 an
> > hour...
> > vs one an hour for the 3.5" drive...
>
> Cheers for doing that - that's useful to know. David, this makes some of
> the discussion with DannyK moot - what do you think about hdd powerdown
> from the desktop?
Hmm, I think this just needs to happen automagically when g-p-m calls
SetPowerSave() on HAL
http://people.freedesktop.org/~david/hal-spec/hal-spec.html#interface-device-systempower
e.g. you'd have the option in g-p-m for both the "On AC" and "On
battery" tabs saying
[x] When idle, power down hard disks and peripherals
that defaults to [x] for "On battery" and [ ] for "On AC". So as far as
I'm concerned the magic just happens in pm-powersave (which is what
SetPowerSave() on HAL calls).
(I also think it's preferable to avoid using hdparm or sdparm for this;
the kernel driver for the hard drive / controller needs to export a
power mgmt aware interface that we can easily poke using sysfs.)
The key thing here is this: The desktop user only needs to tweak a
simple setting (that's all what users care about; "save power or not"),
and we can expand the mechanism of what this does in pm-powersave.
How about that?
David
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