linux-kernel - Re: AHCI power saving (was Re: Ten hours on X60s)

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Message-Id: <200611131608.kADG8DIM004032@turing-police.cc.vt.edu>
Date:	Mon, 13 Nov 2006 11:08:13 -0500
From:	Valdis.Kletnieks@...edu
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Andi Kleen <ak@...e.de>, Pavel Machek <pavel@....cz>,
	John Fremlin <not@...t.any.name>,
	kernel list <linux-kernel@...r.kernel.org>, htejun@...il.com,
	jim.kardach@...el.com
Subject: Re: AHCI power saving (was Re: Ten hours on X60s)

On Mon, 13 Nov 2006 10:48:53 EST, Jeff Garzik said:
> Andi Kleen wrote:
> >> Therein lies a key problem.  Turning on all of AHCI's aggressive power 
> >> management features DOES save a lot of power.  But at the same time, it 
> >> shortens the life of your hard drive, particularly hard drives that are 
> >> really PATA, but have a PATA<->SATA bridge glued on the drive to enable 
> >> connection to SATA controllers.
> > 
> > How does it shorten its life?
> 
> Parks your hard drive heads many thousands of times more often than it 
> does without the aggressive PM features.

I've heard tell that the controller chip chews almost as much power as
the drive motor does - is there an option that says "Controller take a
snooze till we wake you up, but leave the drive spinning"?

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