Date: Sun, 21 Mar 1999 14:17:13 +0000 (GMT) From: Nick Hilliard <nick@iol.ie> To: grog@lemis.com (Greg Lehey) Cc: tom@sdf.com, nick@iol.ie, freebsd-scsi@FreeBSD.ORG Subject: Re: dpt raid-5 performance Message-ID: <199903211417.OAA28733@beckett.earlsfort.iol.ie> In-Reply-To: <19990321084436.Z429@lemis.com> from "Greg Lehey" at Mar 21, 99 08:44:36 am
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> I haven't yet replied to Nick's message because I wanted to check > something here first, and I've been too busy so far. But I'll come > back with some comparisons. I'm going to run some benchmarks over the next few days and see what they throw up. My instinct was that 512K was a "good" interleave size in some sense of the word, mainly because of the fact that it would cause so many fewer disk io ops in most circumstances -- in fact, all circumstances except where you're doing piles of tiny io ops. The bonnie results seem to shatter this illusion. Does anyone know if a 2044W card creates exactly the same RAID structure on a disk array as a 3334UW? I have both cards lying around the place at the moment, and it would trivial to run benchmarks for both systems just by replacing the card on the machine. Nick Hilliard Ireland On-Line System Operations To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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