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Re: How many people regularly defrag their XFS filesystems?

To: Bogdan Costescu <Bogdan.Costescu@xxxxxxxxxxxxxxxxxxxxx>
Subject: Re: How many people regularly defrag their XFS filesystems?
From: Eric Sandeen <sandeen@xxxxxxx>
Date: Mon, 27 Mar 2006 08:37:15 -0600
Cc: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>, KELEMEN Peter <Peter.Kelemen@xxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.64.0603271225290.11894@dingo.iwr.uni-heidelberg.de>
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Bogdan Costescu wrote:
On Sun, 26 Mar 2006, Justin Piszcz wrote:

Does anyone have any benchmarks for the XFS filesystem contrasted with the amount of fragmentation on the disk?


Not real benchmarks (which could be too specific), but a real world situation. I have at home a computer with a large PATA disk with XFS on it. This disk receives small amounts of data in time, from video encodes (own home productions and I like to experiment with filters a lot so data rate could be really low) or P2P applications (like recently from FC5 and CentOS 4.3 DVDs), either directly (run on the same computer) or via Samba.

FWIW, many P2P applications will -horribly- fragment the downloaded files, as the chunks of the file come in randomly. Try to find one that is smart enough to use pre-allocation on xfs filesystems, and you should see a marked improvement.


-Eric


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