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Re: poor io performance with xfs+raid5

To: Simon Matter <simon.matter@xxxxxxxxxxxxxxxx>
Subject: Re: poor io performance with xfs+raid5
From: Mike Eldridge <diz@xxxxxxxxx>
Date: Thu, 25 Apr 2002 14:40:25 -0500
Cc: Justin Coffey <justin@xxxxxxxxx>, Steve Lord <lord@xxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <3CC85999.501431E5@ch.sauter-bc.com>; from simon.matter@ch.sauter-bc.com on Thu, Apr 25, 2002 at 09:31:37PM +0200
References: <Pine.BSO.4.44.0204251216360.25324-100000@paperboy.websocietyinc.com> <3CC85999.501431E5@ch.sauter-bc.com>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Mutt/1.2.5i
On Thu, Apr 25, 2002 at 09:31:37PM +0200, Simon Matter wrote:
> Justin Coffey schrieb:
> > 
> > Quick related question... (and I haven't been following the group closely
> > recently) does this affect any sort of hardware RAID 5?  What about RAID
> > 1+0?
> 
> Hi,
> 
> Hardware RAID is not affected at all. All levels of Software RAID beside
> RAID5 are okay. The only problem is with Software RAID5 and internal
> log. Under some circumstances, this config can slow down performance
> _dramatically_.

it should be noted that i am using hardware raid5:

> > > > the system is configured as such:
> > > >     60GB RAID5 (escalade 7850 + 4x20GB IBM deskstar) mounted on /var
> > > >     log=internal,bsize=4096,blocks=1839
> > > >     agcount=58,agsize=262144 blocks
> > > >     realtime=none

via a 3ware escalade 7850 ata-raid card.

-mike

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