Date: Fri, 23 Jul 1999 18:56:43 -0400 (EDT) From: David Gilbert <dgilbert@velocet.ca> To: Jeremy McMillan <aphor@ripco.com> Cc: mcmillan@cboe.com, freebsd-scsi@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: Postmark results with DPT RAID-5 Message-ID: <14232.62251.3136.872573@trooper.velocet.ca> In-Reply-To: <Pine.SV4.3.91.990723100950.7689E-100000@golden.ripco.com> References: <14232.30911.431405.352467@trooper.velocet.ca> <Pine.SV4.3.91.990723100950.7689E-100000@golden.ripco.com>
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>>>>> "Jeremy" == Jeremy McMillan <aphor@ripco.com> writes: Jeremy> On Fri, 23 Jul 1999, David Gilbert wrote: >> >>>>> "Yusuf" == Yusuf Goolamabbas <yusufg@outblaze.com> 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
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