Date: Sun, 21 Mar 1999 07:46:13 +1030 From: Greg Lehey <grog@lemis.com> To: Tom <tom@sdf.com>, Nick Hilliard <nick@iol.ie> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: dpt raid-5 performance Message-ID: <19990321074613.V429@lemis.com> In-Reply-To: <Pine.BSF.4.05.9903200850440.12986-100000@misery.sdf.com>; from Tom on Sat, Mar 20, 1999 at 08:55:27AM -0800 References: <199903191422.OAA27845@beckett.earlsfort.iol.ie> <Pine.BSF.4.05.9903200850440.12986-100000@misery.sdf.com>
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On Saturday, 20 March 1999 at 8:55:27 -0800, Tom wrote: > > On Fri, 19 Mar 1999, Nick Hilliard wrote: > >> If I set up a raid-5 system on these disks with a slice-size of 512K, the >> write performance is terrible. Bonnie reports: > > 512k will not result in very good single process write performance. > In fact, 512k is suboptimal for many operations on RAID-5 arrays. I disagree. It's pretty much optimal for Vinum. I'd be interested in your reasoning. > If you are optimizing for a single process, use something smaller > (like 8k). That's far, far too small. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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