From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Greg Freemyer" Subject: Re: SAS v SATA interface performance Date: Sat, 1 Dec 2007 09:37:03 -0500 Message-ID: <87f94c370712010637o5efa9c4rd9a86ec5a3cba6ff@mail.gmail.com> References: <47506237.3000406@clear.net.nz> <47507F9A.3080109@msgid.tls.msk.ru> <20071130231705.51e056f4@the-village.bc.nu> <475110A8.5090709@clear.net.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from an-out-0708.google.com ([209.85.132.250]:61463 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752367AbXLAOhE (ORCPT ); Sat, 1 Dec 2007 09:37:04 -0500 Received: by an-out-0708.google.com with SMTP id d31so536214and for ; Sat, 01 Dec 2007 06:37:04 -0800 (PST) In-Reply-To: <475110A8.5090709@clear.net.nz> Content-Disposition: inline Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Richard Scobie Cc: Alan Cox , linux-ide@vger.kernel.org On Dec 1, 2007 2:43 AM, Richard Scobie wrote: > > > Alan Cox wrote: > > > If you want really high performance use multiple drives, on multiple PCIE > > controllers. Just make sure your backup planning of raid 1+0 setup is > > done right as many drives means a lot more drive fails. > > Thanks again. For what it's worth, I shall be attempting this with SATA > drives in a RAID 50 configuration - 2 x 8 drives, using md RAID and an 8 > lane PCIe SAS HBA. > I suspect many of us will be curious of the performance results. Also, if you have Port Multiplexers (PMPs) in use, that would be interesting to know. I don't even know if PMPs are supported via SAS controllers in 2.6.24 or not. ie. PMP support is new to 2.6.24 and only a few Sata controllers will have PMP support in 2.6.24. Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com