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Re: XFS + SMP + Software RAID 5 slow?

To: Andrew Klaassen <ak@xxxxxxx>, linux-xfs@xxxxxxxxxxx
Subject: Re: XFS + SMP + Software RAID 5 slow?
From: Seth Mos <knuffie@xxxxxxxxx>
Date: Mon, 03 Nov 2003 13:07:29 +0100
In-reply-to: <20031031215013.GB25822@dkp.com>
Sender: linux-xfs-bounce@xxxxxxxxxxx
At 16:50 31-10-2003 -0500, Andrew Klaassen wrote:
I've been experiencing *very* slow sustained write ( < .5MB/sec)
using 2.4.20-20.9.XFS1.3.1smp on a dual-Xeon box with a 3ware
7506 card in JBOD mode.  Software RAID 5.  No such problems with
Ext3 ( > 20MB/sec sustained write) with the same kernel on the
same software RAID 5 device.  Obviously there's something very
wrong here.

You are probably not using a version 2 logfile.

See the manpage for exact syntax. IIRC it's something like:
mkfs.xfs -l size=32768b,version=2 /dev/md?

You can also specify sunit and swidth parameters but mkfs.xfs should set those automatically.

Cheers
--
Seth
I don't make sense, I don't pretend to either. Questions?


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