From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: xfs: very slow after mount, very slow at umount
Date: Wed, 26 Jan 2011 23:17:13 -0600 [thread overview]
Message-ID: <4D40FFD9.80707@hardwarefreak.com> (raw)
In-Reply-To: <4D40EB2F.2050809@teksavvy.com>
Mark Lord put forth on 1/26/2011 9:49 PM:
> agcount=7453
That's probably a bit high Mark, and very possibly the cause of your problems.
:) Unless the disk array backing this filesystem has something like 400-800
striped disk drives. You said it's a single 2TB drive right?
The default agcount for a single drive filesystem is 4 allocation groups. For
mdraid (of any number of disks/configuration) it's 16 allocation groups.
Why/how did you end up with 7452 allocation groups? That can definitely cause
some performance issues due to massively excessive head seeking, and possibly
all manner of weirdness.
--
Stan
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next prev parent reply other threads:[~2011-01-27 5:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4D40C8D1.8090202@teksavvy.com>
2011-01-27 3:30 ` xfs: very slow after mount, very slow at umount Dave Chinner
2011-01-27 3:49 ` Mark Lord
2011-01-27 5:17 ` Stan Hoeppner [this message]
2011-01-27 15:12 ` Mark Lord
2011-01-27 15:40 ` Justin Piszcz
2011-01-27 16:03 ` Mark Lord
2011-01-27 19:40 ` Stan Hoeppner
2011-01-27 20:11 ` david
2011-01-27 23:53 ` Stan Hoeppner
2011-01-28 2:09 ` david
2011-01-28 13:56 ` Dave Chinner
2011-01-28 19:26 ` david
2011-01-29 5:40 ` Dave Chinner
2011-01-29 6:08 ` david
2011-01-29 7:35 ` Dave Chinner
2011-01-31 19:17 ` Christoph Hellwig
2011-01-27 21:56 ` Mark Lord
2011-01-28 0:17 ` Dave Chinner
2011-01-28 1:22 ` Mark Lord
2011-01-28 1:36 ` Mark Lord
2011-01-28 4:14 ` David Rees
2011-01-28 14:22 ` Mark Lord
2011-01-28 7:31 ` Dave Chinner
2011-01-28 14:33 ` Mark Lord
2011-01-28 23:58 ` Dave Chinner
2011-01-28 19:18 ` Martin Steigerwald
2011-01-27 20:24 ` John Stoffel
2011-01-27 23:41 ` Dave Chinner
2011-01-28 0:59 ` Mark Lord
2011-01-27 23:39 ` Dave Chinner
[not found] ` <4D40CDCF.4010301@teksavvy.com>
2011-01-27 3:43 ` Dave Chinner
2011-01-27 3:53 ` Mark Lord
2011-01-27 4:54 ` Mark Lord
2011-01-27 23:34 ` Dave Chinner
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