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

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Date:	Mon, 13 Nov 2006 10:48:53 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <ak@...e.de>
CC:	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)

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.

	Jeff



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