Re: How many people regularly defrag their XFS filesystems?

[Eric Sandeen <sandeen@xxxxxxx>]

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