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Re: Defragging XFS File Systems

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: Defragging XFS File Systems
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Thu, 09 Jun 2011 03:13:32 -0500
Cc: xfs@xxxxxxxxxxx, Kenneth Emerson <kenneth.emerson@xxxxxxxxx>
In-reply-to: <201106090749.37745@xxxxxx>
References: <BANLkTi=40mmE+DCbLcSWBwNQtWpP=N=tXw@xxxxxxxxxxxxxx> <BANLkTikBSL8-eTAbF7a94ckLuZNyWCM=Eg@xxxxxxxxxxxxxx> <4DEFE2E6.9010206@xxxxxxxxxxxxxxxxx> <201106090749.37745@xxxxxx>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20110414 Thunderbird/3.1.10
On 6/9/2011 12:49 AM, Michael Monnerie wrote:
> On Mittwoch, 8. Juni 2011 Kenneth wrote:
>>> After that, I will make
>>> a cron job to run on a regular basis to keep the volume from
>>> getting so fragmented again.
> How will you do that? Running xfs_fsr on a regular basis is *not* 
> recommended, as it will age your filesystem and defrag free space. In 
> the beginning, and as long as your filesystem is maybe 50% full it will 
> be fine, but there's a point where it starts to get worse - much worse. 
> Just run a recent kernel, it has all the naughty stuff to help keep the 
> performance high.

When *is* running xfs_fsr recommended?

I scheduled it twice a week some time ago due to a filesystem containing
active mbox files.  I did so because they became so heavily fragmented
in short order, especially those swallowing copious amounts of list
mail.  Before cron'ing xfs_fsr I was seeing mbox files with over 1000
fragmented extents, and increasing MUA latency as the files became more
fragmented.  The filesystem is currently 90% free.


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