linux-kernel - Re: [git patches] libata hibernation fixes

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Message-ID: <20081104203036.GE5862@ucw.cz>
Date:	Tue, 4 Nov 2008 21:30:37 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git patches] libata hibernation fixes

Hi!

>  - quite possibly: we just should not spin down disks at all, and just 
>    flush them and do the "park" command thing. If we're _really_ powering 
>    off, the disks will spin down on their own when power goes away. Maybe 
>    that's what Windows does?

I believe that 'emergency' spindown (on power fail) is different from
regular spindown, and that emergency spindown damages the disk more.

But perhaps park + power fail is similar to regular spindown?

(Is park command normally supported on modern disks? IIRC hdaps people
had issues with not all disks supporting it?)

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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