From: Andrew Clayton <andrew@digital-domain.net>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: Andrew Clayton <andrew@pccl.info>, linux-raid@vger.kernel.org
Subject: Re: RAID 5 performance issue.
Date: Wed, 3 Oct 2007 21:19:10 +0100 [thread overview]
Message-ID: <20071003211910.439ded54@alpha.digital-domain.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0710031243080.8612@p34.internal.lan>
On Wed, 3 Oct 2007 12:43:24 -0400 (EDT), Justin Piszcz wrote:
> Have you checked fragmentation?
You know, that never even occurred to me. I've gotten into the mind set
that it's generally not a problem under Linux.
> xfs_db -c frag -f /dev/md3
>
> What does this report?
# xfs_db -c frag -f /dev/md0
actual 1828276, ideal 1708782, fragmentation factor 6.54%
Good or bad?
Seeing as this filesystem will be three years old in December, that
doesn't seem overly bad.
I'm currently looking to things like
http://lwn.net/Articles/249450/ and
http://lwn.net/Articles/242559/
for potential help, fortunately it seems I won't have too long to wait.
> Justin.
Cheers,
Andrew
next prev parent reply other threads:[~2007-10-03 20:19 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-03 9:53 RAID 5 performance issue Andrew Clayton
2007-10-03 16:43 ` Justin Piszcz
2007-10-03 16:48 ` Justin Piszcz
2007-10-03 20:10 ` Andrew Clayton
2007-10-03 20:16 ` Justin Piszcz
2007-10-06 12:30 ` Justin Piszcz
2007-10-06 16:05 ` Justin Piszcz
2007-10-03 20:19 ` Andrew Clayton [this message]
2007-10-03 20:35 ` Justin Piszcz
2007-10-03 20:46 ` Andrew Clayton
2007-10-03 20:36 ` David Rees
2007-10-03 20:48 ` Andrew Clayton
2007-10-04 14:08 ` Andrew Clayton
2007-10-04 14:09 ` Justin Piszcz
2007-10-04 14:10 ` Justin Piszcz
2007-10-04 14:44 ` Andrew Clayton
2007-10-04 16:20 ` Justin Piszcz
2007-10-04 18:26 ` Andrew Clayton
2007-10-05 10:25 ` Justin Piszcz
2007-10-05 10:57 ` Andrew Clayton
2007-10-05 11:08 ` Justin Piszcz
2007-10-05 12:53 ` Andrew Clayton
2007-10-05 13:18 ` Justin Piszcz
2007-10-05 13:30 ` Andrew Clayton
2007-10-05 14:07 ` Justin Piszcz
2007-10-05 14:32 ` Andrew Clayton
2007-10-05 16:10 ` Andrew Clayton
2007-10-05 16:16 ` Justin Piszcz
2007-10-05 19:33 ` Andrew Clayton
2007-10-05 18:58 ` Richard Scobie
2007-10-05 19:02 ` Justin Piszcz
2007-10-05 19:02 ` John Stoffel
2007-10-05 19:42 ` Andrew Clayton
2007-10-05 20:56 ` John Stoffel
2007-10-07 17:22 ` Andrew Clayton
2007-10-11 17:06 ` Bill Davidsen
2007-10-11 18:07 ` Andrew Clayton
2007-10-11 23:43 ` Justin Piszcz
2007-10-04 14:36 ` Andrew Clayton
2007-10-04 14:39 ` Justin Piszcz
2007-10-04 15:03 ` Andrew Clayton
2007-10-04 16:19 ` Justin Piszcz
2007-10-04 19:01 ` Andrew Clayton
2007-10-04 16:46 ` Steve Cousins
2007-10-04 17:06 ` Steve Cousins
2007-10-04 19:06 ` Andrew Clayton
2007-10-05 10:20 ` Justin Piszcz
2007-10-04 14:39 ` Justin Piszcz
2007-10-03 17:53 ` Goswin von Brederlow
2007-10-03 20:20 ` Andrew Clayton
2007-10-03 20:48 ` Richard Scobie
2007-10-05 20:25 ` Brendan Conoboy
2007-10-06 0:38 ` Dean S. Messing
2007-10-06 8:18 ` Justin Piszcz
2007-10-08 1:40 ` Dean S. Messing
2007-10-08 8:44 ` Justin Piszcz
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