From: Christoph Hellwig <hch@infradead.org>
To: Martin Boutin <martboutin@gmail.com>
Cc: Eric Sandeen <sandeen@redhat.com>, xfs-oss <xfs@oss.sgi.com>
Subject: Re: Filesystem writes on RAID5 too slow
Date: Fri, 22 Nov 2013 01:23:25 -0800 [thread overview]
Message-ID: <20131122092325.GA8512@infradead.org> (raw)
In-Reply-To: <CACtJ3HZdF+y9-f6v8Zo6D=uFVPsqZZbQy2vVeXmfTA9a7vwAwg@mail.gmail.com>
On Thu, Nov 21, 2013 at 11:35:14AM -0500, Martin Boutin wrote:
> Sorry for the spam but I just noticed that the XFS stripe unit does not
> match the strip unit of the underlying RAID device. I tried to do a
> mkfs.xfs with a stripe of 512KiB but mkfs.xfs complains that the
> maximum stripe width is 256KiB.
Yeah. Btw, I've generally seen best results using 32k stripes, but that
should only matter for log intensive loads and not simple writes.
Similarly your 32mb log seems awfully small, but not really relevant for
this workload.
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next prev parent reply other threads:[~2013-11-22 9:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CACtJ3HZxp6xEjY_wOucCcqX4scNzEGuiAsovQYObJS9whtYJsQ@mail.gmail.com>
2013-11-18 18:28 ` Filesystem writes on RAID5 too slow Eric Sandeen
2013-11-19 0:57 ` Dave Chinner
2013-11-21 9:11 ` Martin Boutin
2013-11-21 9:26 ` Dave Chinner
2013-11-21 9:50 ` Martin Boutin
2013-11-21 13:31 ` Martin Boutin
2013-11-21 16:35 ` Martin Boutin
2013-11-22 9:23 ` Christoph Hellwig [this message]
2013-11-21 23:41 ` Dave Chinner
2013-11-22 9:21 ` Christoph Hellwig
2013-11-22 22:40 ` Dave Chinner
2013-11-23 8:41 ` Christoph Hellwig
2013-11-24 23:21 ` Dave Chinner
2013-11-22 13:33 ` Martin Boutin
2013-12-10 19:18 ` Christoph Hellwig
2013-12-11 0:27 ` Dave Chinner
2013-12-11 19:09 ` Ben Myers
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