Date: Mon, 01 May 2000 16:43:10 -0700 From: David Greenman <dg@root.com> To: chad@DCFinc.com Cc: blk@skynet.be (Brad Knowles), parag@cgt.com, msmith@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: How good is AMI MegaRAID support? Message-ID: <200005012343.QAA28681@implode.root.com> In-Reply-To: Your message of "Mon, 01 May 2000 16:00:59 PDT." <200005012300.QAA18195@freeway.dcfinc.com>
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>> How fast is fast enough? Do you need a disk subsystem that can >> handle bursts of ~2500 USENET news history database lookups per >> second? What would it take to get to that level? Do you need to see >> rawio read performance (average tranfer size of one sector w/ 64 >> simultaneous processes) of around 5,000 read operations per second? > >We're running quite a bit more than 5,000 iops/sec on the EMC Symmetrix >box that's replacing the A-3500s. > >Just depends on what it is you need done. TeraSolutions' RAID systems (TSR-2200) as used on ftp.freesoftware.com are capable of >9,000 IOPS. There are other issues to consider when thinking about software RAID-5. The most important of these is the (lack of) non-volatile write-back cache. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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