From owner-freebsd-hardware@FreeBSD.ORG  Tue Mar 23 23:57:08 2004
Return-Path: <owner-freebsd-hardware@FreeBSD.ORG>
Delivered-To: freebsd-hardware@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id E5FD316A4CE
	for <freebsd-hardware@freebsd.org>;
	Tue, 23 Mar 2004 23:57:08 -0800 (PST)
Received: from brabys.co.za (postoffice.brabys.co.za [192.96.48.13])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5C96C43D1D
	for <freebsd-hardware@freebsd.org>;
	Tue, 23 Mar 2004 23:57:04 -0800 (PST)
	(envelope-from nelis@brabys.co.za)
Received: from [192.96.48.37] (proxy-inner.brabys.co.za [192.96.48.11])
	by brabys.co.za (8.12.0/8.12.0) with ESMTP id i2O7u63m013704
	for <freebsd-hardware@freebsd.org>; Wed, 24 Mar 2004 09:56:06 +0200
From: Nelis Lamprecht <nelis@brabys.co.za>
To: freebsd-hardware@freebsd.org
Content-Type: text/plain
Message-Id: <1080114966.33376.276.camel@enigma.8ball.co.za>
Mime-Version: 1.0
X-Mailer: Ximian Evolution 1.4.5 
Date: Wed, 24 Mar 2004 09:56:07 +0200
Content-Transfer-Encoding: 7bit
X-MailScanner: Found to be clean
Subject: Slow transfer speeds with U320 drives and HP Smart Array 641
X-BeenThere: freebsd-hardware@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: nelis@brabys.co.za
List-Id: General discussion of FreeBSD hardware
	<freebsd-hardware.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hardware>,
	<mailto:freebsd-hardware-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hardware>
List-Post: <mailto:freebsd-hardware@freebsd.org>
List-Help: <mailto:freebsd-hardware-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hardware>,
	<mailto:freebsd-hardware-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Mar 2004 07:57:09 -0000

Hi,

With the ciss driver on my HP ProLiant ML350 I've noticed the transfer
speed on my RAID controller is only.

da0 at ciss0 bus 0 target 0 lun 0
da0: <COMPAQ RAID 1  VOLUME OK> Fixed Direct Access SCSI-0 device
da0: 135.168MB/s transfers
da0: 69459MB (142253280 512 byte sectors: 255H 32S/T 17433C)

Both my drives on the RAID controller are U320 72GB pluggable SCSI's.
The RAID card also has the optional 64MB battery backed write back cache
enabler installed.
I also have a AIC 50/100 Tape Drive in the machine which is connected to the
onboard SCSI interface.

sa0 at ahc1 bus 0 target 6 lun 0
sa0: <COMPAQ SDX-500C 1.35> Removable Sequential Access SCSI-2 device
sa0: 40.000MB/s transfers (20.000MHz, offset 7, 16bit)

My question is why the slow transfer speed of the RAID controller ? Does this
have anything to do with the slower SCSI Tape Drive or is this a limitation of
the ciss driver ? Or perhaps I have misconfigured something ?

Any advice would be appreciated. Thanks for your reply.

Kind Regards,
Nelis