Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 1C0E82E151C for ; Tue, 13 Nov 2007 11:49:59 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 14728-05 for ; Tue, 13 Nov 2007 11:49:55 -0400 (AST) Received: from skynet.simkin.ca (skynet.simkin.ca [72.51.27.117]) by postgresql.org (Postfix) with ESMTP id 9CA342E14BF for ; Tue, 13 Nov 2007 11:49:54 -0400 (AST) Received: from hal.simkin.ca (S0106000c6eb33e73.vc.shawcable.net [70.79.155.38]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by skynet.simkin.ca (Postfix) with ESMTP id 716334711 for ; Tue, 13 Nov 2007 07:49:52 -0800 (PST) From: Alan Hodgson Organization: Simkin Network Consulting To: pgsql-performance@postgresql.org Subject: Re: dell versus hp Date: Tue, 13 Nov 2007 07:49:49 -0800 User-Agent: KMail/1.9.7 References: <82607932-FC46-4B73-BF78-2290EE55F7F5@pvv.ntnu.no> <200711081256.41880@hal.medialogik.com> <26BFDB02-6BE0-4CD8-8F01-415C4D7D32CF@kcilink.com> In-Reply-To: <26BFDB02-6BE0-4CD8-8F01-415C4D7D32CF@kcilink.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200711130749.49594@hal.simkin.ca> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200711/196 X-Sequence-Number: 27611 On November 9, 2007, Vivek Khera wrote: > On Nov 8, 2007, at 3:56 PM, Alan Hodgson wrote: > > You can't touch RAID 10 for performance or reliability. The only > > reason to > > use RAID 5 or RAID 6 is to get more capacity out of the same > > drives. > > Maybe you can't, but I can. I guess I have better toys than you :-) > OK, I'll bite. Name one RAID controller that gives better write performance in RAID 6 than it does in RAID 10, and post the benchmarks. I'll grant a theoretical reliability edge to RAID 6 (although actual implementations are a lot more iffy), but not performance. -- The ethanol craze means that we're going to burn up the Midwest's last six inches of topsoil in our gas-tanks.