linux-ext4 - Re: Newbie ext2 forensics question...

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Message-ID: <20060929172438.GQ22010@schatzie.adilger.int>
Date:	Fri, 29 Sep 2006 11:24:38 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Dave Edwards <ext2@....lusars.net>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Newbie ext2 forensics question...

On Sep 29, 2006  04:47 +0000, Dave Edwards wrote:
> I'm trying to tune a linux system to spin down its (ext2-formatted) disk when
> the system is idle. I've worked down to two problematic applications that
> periodically spin up the disk, even though the (tiny) file they're writing is
> (allegedly) on a tmpfs partition (/tmp/application/datafile, as it happens).
> Enabling the vm debugging gets me output like:
> 
> kjournald(303): WRITE block 151824 on hda1
> kjournald(303): WRITE block 151832 on hda1
> kjournald(303): WRITE block 151840 on hda1
> kjournald(303): WRITE block 151848 on hda1
> kjournald(303): WRITE block 151856 on hda1
> kjournald(303): WRITE block 151864 on hda1

This is ext3 (journal thread) not ext2.

> pdflush(135): WRITE block 258211840 on hda1
> pdflush(135): WRITE block 258211848 on hda1
> pdflush(135): WRITE block 258211856 on hda1
> pdflush(135): WRITE block 258310144 on hda1
> pdflush(135): WRITE block 0 on hda1
> pdflush(135): WRITE block 16 on hda1
> pdflush(135): WRITE block 64 on hda1
> pdflush(135): WRITE block 56098816 on hda1
> pdflush(135): WRITE block 56100968 on hda1
> pdflush(135): WRITE block 61079552 on hda1

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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