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

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Date:	Tue, 21 Nov 2006 13:40:56 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mark Lord <lkml@....ca>
CC:	Jeff Garzik <jeff@...zik.org>, Andi Kleen <ak@...e.de>,
	Pavel Machek <pavel@....cz>, John Fremlin <not@...t.any.name>,
	kernel list <linux-kernel@...r.kernel.org>,
	jim.kardach@...el.com
Subject: Re: AHCI power saving (was Re: Ten hours on X60s)

Mark Lord wrote:
> Jeff Garzik wrote:
>> Andi Kleen wrote:
>>
>>> 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.
> 
> Spinning-down would definitely shorten the drive lifespan.  Does it do 
> that?
> 
> Parking heads is more like just doing some extra (long) seeks.
> Is this documented somewhere as being a life-shortening action?

I wrote this in the other thread but writing here too for documentation 
purpose.

* HL-DT-ST DVD-RAM GSA-H30N locks up completely on slumber.  Physical 
power removal and reapply is the only to recover it.

* Some WD raptors spin down (yeap, that's right, it spins down) on slumber.

Wonderful world of ATA.  :-P

-- 
tejun
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