From owner-freebsd-scsi Fri Jul 23 16:11:34 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from trooper.velocet.ca (trooper.velocet.net [209.167.225.226]) by hub.freebsd.org (Postfix) with ESMTP id A33AA1574B; Fri, 23 Jul 1999 16:10:27 -0700 (PDT) (envelope-from dgilbert@trooper.velocet.ca) Received: (from dgilbert@localhost) by trooper.velocet.ca (8.9.3/8.9.3) id SAA23757; Fri, 23 Jul 1999 18:56:43 -0400 (EDT) (envelope-from dgilbert) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14232.62251.3136.872573@trooper.velocet.ca> Date: Fri, 23 Jul 1999 18:56:43 -0400 (EDT) To: Jeremy McMillan Cc: mcmillan@cboe.com, freebsd-scsi@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: Postmark results with DPT RAID-5 In-Reply-To: References: <14232.30911.431405.352467@trooper.velocet.ca> X-Mailer: VM 6.71 under 20.4 "Emerald" XEmacs Lucid Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >>>>> "Jeremy" == Jeremy McMillan writes: Jeremy> On Fri, 23 Jul 1999, David Gilbert wrote: >> >>>>> "Yusuf" == Yusuf Goolamabbas writes: >> Yusuf> Hi, I am trying to stress test a DPT RAID controller DPT Yusuf> SmartRaid Ultra PM3334UW (Is there any standard mechanism or a Yusuf> methodology available for this). Any way, I am using the Yusuf> benchmark tool "Postmark" written by Network Appliance which is Yusuf> available via the URL Yusuf> http://www.netapp.com/technology/level3/3022.html. >> I configured a DPT-3334UW on a K6-II/400 machine with 4 9G SCSI >> drives. I found that for creating and deleting files, it couldn't >> be beat (Ports would untar 4 times faster, for instance). However, >> I found that a single 9G on a 2940UW would easily beat the raw >> throughput. I was dissapointed with this. Jeremy> Why is this so? How's your DPT cache configured? I talked with the driver author and somewhat determined that my level of performance was expected. When you think about it, the 3334 is a 68040 --- which can run as fast as 50Mhz. Now, I'm sure that they have other special hardware there, but the thruput bottleneck on the 3334 is likely the 68040. ... This would also probably be why later cards are based on RISC processors. Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message