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

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Message-Id: <200811042208.42982.rjw@sisk.pl>
Date:	Tue, 4 Nov 2008 22:08:42 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [git patches] libata hibernation fixes

On Tuesday, 4 of November 2008, Pavel Machek wrote:
> 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?)

I don't know really and that's why I'd prefer it if Tejun commented here.

Anyway, I created these patches because the people who discussed this issue
believed it was the right thing to do.  They are based on a Tejun's patch
posted as an attachment to http://bugzilla.kernel.org/show_bug.cgi?id=8855 .
Please look into that bug entry for further references.

Thanks,
Rafael
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