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

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Message-ID: <20061113220127.GA1704@elf.ucw.cz>
Date:	Mon, 13 Nov 2006 23:01:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	Mark Lord <lkml@....ca>
Cc:	Jeff Garzik <jeff@...zik.org>, Andi Kleen <ak@...e.de>,
	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 2006-11-13 12:58:10, 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?

Not on my machine.

> Parking heads is more like just doing some extra (long) seeks.
> Is this documented somewhere as being a life-shortening action?

I do not see any effects after applying that patch.
								Pavel

-- 
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