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Re: xfs on notebooks (noflushd etc.)

To: Juri Haberland <juri@xxxxxxxxxxxxxx>
Subject: Re: xfs on notebooks (noflushd etc.)
From: Andrew Morton <andrewm@xxxxxxxxxx>
Date: Tue, 17 Jul 2001 12:06:27 +1000
Cc: linux-xfs@xxxxxxxxxxx
References: <news2mail-20010715165102.42C97E94.NOFFLE@xxxxxxxxxxxxxxxxxxx> <news2mail-9iv2vc$nfo$1@xxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
Juri Haberland wrote:
> 
> thomas graichen <list-linux.sgi.xfs@xxxxxxxxxxx> wrote:
> > just out of curiousity: how does xfs interact with things like
> > noflushd which reduce the disk flushing for more effective ide
> > poweroff possibilities ... is the flushing below the fs layer
> > so that it should all work transparently or may it result in
> > problems with xfs (or journaling fs in general)?
> 
> Hi Thomas,
> 
> well, I cannot speak for xfs but with ext3 the disk will only spin
> down once; after this it will be constantly restarted by the update
> mechanisms of ext3 (commit interval is 5 seconds).

ext3's commit only runs if there is dirty data to be committed.
Running ext3 with a kupdate interval of 15 minutes lets the disks
spin down nicely.


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