Date: Tue, 4 Sep 2001 13:52:02 +0100 From: "Lawrence Farr" <lawrence@epcdirect.co.uk> To: "'David Gilbert'" <dgilbert@velocet.ca>, "'Greg Lehey'" <grog@FreeBSD.ORG> Cc: "'Chris BeHanna'" <behanna@zbzoom.net>, "'FreeBSD-Stable'" <stable@FreeBSD.ORG> Subject: RE: [stable] Re: RAID5 Message-ID: <000301c13540$64fbfee0$c80aa8c0@lfarr> In-Reply-To: <15252.51690.121158.427612@trooper.velocet.net>
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Just to add another benchmark, I got: Pass 23 - 1048576 kb written in 115 seconds, at 9118 kb/Sec Pass 23 - 1048576 kb read in 15 seconds, at 69905 kb/Sec On some recent tests on a 3Ware 7000 series with 8 x 5400rpm IDE drives. >-----Original Message----- >From: owner-freebsd-stable@FreeBSD.ORG >[mailto:owner-freebsd-stable@FreeBSD.ORG] On Behalf Of David Gilbert >Sent: 04 September 2001 13:33 >To: Greg Lehey >Cc: Chris BeHanna; FreeBSD-Stable >Subject: [stable] Re: RAID5 > > >>>>>> "Greg" == Greg Lehey <grog@FreeBSD.org> writes: > >Greg> On Monday, 3 September 2001 at 14:20:56 -0400, Chris BeHanna >Greg> wrote: >>> FWIW, I set up a 4-drive RAID-5 volume with an associated >>> journaling device on Solaris 8 that performs pretty well for home >>> directories. I wouldn't expect vinum to be any different in that >>> regard, given sufficient CPU (my Solaris volume is served from a >>> two-CPU E450, just as a reference point). > >Greg> Interestingly, CPU isn't the performance issue most people >Greg> (myself once included) assume it is. Even on my original Vinum >Greg> testbed, a 468/66, CPU usage was barely measurable. That's >Greg> probably why most hardware RAID controllers use relatively slow >Greg> CPUs. > >Well... then its an interesting issue: At least on FreeBSD, my >benchmarks show that Vinum running with Adaptec (ahc) or TekRAM (sym) >controllers outperform hardware raid controllers significantly. We're >talking same drives, same cables, same computer here. > >Not only does Vinum outperform hardware RAID 5, but it also >outperforms hardware RAID 0 and RAID 1. > >Now... these are all FreeBSD tests. Maybe the FreeBSD hardware raid >controller drivers suck? > >As an example (numbers I have readily available), my test bed was 8x >18G Atlas IV drives (SCA if it matters) in a dedicated LVD case. I >was testing the AMI MegaRAID 1500 against Vinum running with either an >Adaptec 29160 or a TekRAM (forget model number, but it was LVD-80 not >LVD-160). > >I found that write speeds were pretty much even all around... with a >slight edge to Vinum --- 4M/s writes on the AMI, 4.5M/s writes on >Vinum. Reading, however, is where vinum dusted the competition. On >either SCSI controller, Vinum could achieve 51M/s reads compared to >18M/s reads on the AMI. Interestingly, the figure for vinum changes >with CPU speed --- it was only 38M/s reads with a PIII/450 (100Mhz >RAM) ... the 51M/s measurement was an Athlon 750 (133Mhz RAM). > >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-stable" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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