linux-kernel - Re: Disk access just before shutdown power off.

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Message-Id: <1248193544.4873.1.camel@perihelion.bos.jonmasters.org>
Date:	Tue, 21 Jul 2009 12:25:44 -0400
From:	Jon Masters <jonathan@...masters.org>
To:	James Courtier-Dutton <James@...erbug.demon.co.uk>
Cc:	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: Disk access just before shutdown power off.

On Mon, 2009-07-20 at 14:34 +0100, James Courtier-Dutton wrote:

> When I shutdown my Linux laptop, it does an orderly shutdown with quite
> a lot of HD activity during shutdown which eventually stops when the
> screen goes blank. Then there is some delay (5-10 seconds) and then a
> quick flurry of HD access just before it powers itself off.

That would be the journal being synced back to disk as an fsync is done
prior to unmounting/remounting-ro. You can't do anything about this
because it needs to be the last thing that is done.

Jon.

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