X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 36CE79FB2F8 for ; Wed, 9 Aug 2006 18:09:15 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 04551-04 for ; Wed, 9 Aug 2006 18:09:05 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from noel.decibel.org (noel.decibel.org [67.100.216.10]) by postgresql.org (Postfix) with ESMTP id 8AEBA9FB1F0 for ; Wed, 9 Aug 2006 18:09:05 -0300 (ADT) Received: by noel.decibel.org (Postfix, from userid 1001) id 35B6A5643D; Wed, 9 Aug 2006 16:09:04 -0500 (CDT) Received: (hashcash-sendmail, from uid 1001); Wed, 9 Aug 2006 16:09:04 -0500 Date: Wed, 9 Aug 2006 16:09:04 -0500 From: "Jim C. Nasby" To: pgsql-performance@postgresql.org Subject: Re: Performance with 2 AMD/Opteron 2.6Ghz and 8gig Message-ID: <20060809210903.GS40481@pervasive.com> References: <7F10D26ECFA1FB458B89C5B4B0D72C2B4E4D9B@sesrv12.wirelesscar.com> <44D72D11.7050203@logix-tt.com> <33c6269f0608071302h6429cfcn71074709c5cd53ff@mail.gmail.com> <20060807202002.GA7380@uio.no> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060807202002.GA7380@uio.no> X-Operating-System: FreeBSD 6.0-RELEASE-p4 amd64 X-Distributed: Join the Effort! http://www.distributed.net User-Agent: Mutt/1.5.11 X-Hashcash: 1:20:060809:pgsql-performance@postgresql.org::Hou3/JpKSuLBb6J7:00000 000000000000000000000000011s X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.103 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200608/161 X-Sequence-Number: 20346 On Mon, Aug 07, 2006 at 10:20:02PM +0200, Steinar H. Gunderson wrote: > On Mon, Aug 07, 2006 at 04:02:52PM -0400, Alex Turner wrote: > > Although I for one have yet to see a controller that actualy does this (I > > believe software RAID on linux doesn't either). > > Linux' software RAID does. See earlier threads for demonstrations. The real question: will it balance within a single thread? Cheaper raid setups will balance individual requests between devices, but good ones should be able to service a single request from both devices (assuming it's reading more than whatever the stripe size is). -- Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461