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To: Lei Sun <lei.sun@gmail.com>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 16 Aug 2005 09:45:49 -0400
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Cc: questions@freebsd.org
Subject: Re: disk fragmentation, <0%?
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Don't top-post, please.

Lei Sun <lei.sun@gmail.com> writes:

> Then, my other question is,
> 
> If the file space allocation works like Glenn said earlier, how come
> with the exact same files from 2 different installations using the
> exact procedures, can result in different fragmentation?
> 
> in the atacontrol raid1 failure case, /dev/ar0s1a: ... 0.5% fragmentation
> in the new build case, /dev/ar0s1a: ... 0.0% fragmentation
> 
> That doesn't seems to make a lot of sense.

There are lots of possible explanations, including (non-harmful) race
conditions.  Is there some reason you care?