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Date:      Thu, 7 Apr 2005 01:42:14 -0700 (PDT)
From:      Brian Behlendorf <brian@hyperreal.org>
To:        Carl Makin <carl@xena.IPAustralia.gov.au>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: IBM eServer 346 ServeRaid is too slow
Message-ID:  <20050407013544.W73813@paz.hyperreal.org>
In-Reply-To: <42548B2D.9010503@xena.ipaustralia.gov.au>
References:  <200504061842.43294.eugene@imedia.ru> <42548B2D.9010503@xena.ipaustralia.gov.au>

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On Thu, 7 Apr 2005, Carl Makin wrote:
> I'd say you are seeing the same as I am with the same card in a Dell 1855. 
> There is something wrong with the mpt driver and the disks when they are 
> setup in a raid0 set.  If you split the disks and use them as individual 
> drives then you will get full performance.

It's also a known problem, though not being tracked very well.

http://lists.freebsd.org/pipermail/freebsd-scsi/2004-December/001577.html
http://lists.freebsd.org/pipermail/freebsd-scsi/2004-December/001578.html

Doesn't look like (from viewcvs.cgi) there's been any recent work on 
this.

 	Brian



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