linux-kernel - Re: finding reasons for disk spin ups

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Message-ID: <20090623181409.GA12814@srcf.ucam.org>
Date:	Tue, 23 Jun 2009 19:14:09 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Norbert Preining <preining@...ic.at>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: finding reasons for disk spin ups

On Tue, Jun 23, 2009 at 07:00:06PM +0200, Norbert Preining wrote:
> Hi all,
> (please cc)
> 
> is there a way I can find the reasons why my disk is spinning up again
> and again? I tried to monitor io with
> 	iotop -o -d 0.01 -b -qqq -t
> but sometimes the disks spins up without anything showing up.
> The partitions are mounted with noatime.
> 
> Is there any kernel interface telling me why/whcih process called for
> the sync so that the disk wakes up?

Yes. /proc/sys/vm/block_dump - set that to 1. Make sure you disable 
syslog first.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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