Received: from maia.hub.org (maia-5.hub.org [200.46.204.29]) by mail.postgresql.org (Postfix) with ESMTP id CDB55B5DBC4 for ; Wed, 17 Aug 2011 15:40:00 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.29]) (amavisd-maia, port 10024) with ESMTP id 92374-01 for ; Wed, 17 Aug 2011 18:39:54 +0000 (UTC) X-Greylist: delayed 00:06:41.23852 by SQLgrey-1.7.6 Received: from gpdnet.co.uk (gpdnet.plus.com [212.56.100.243]) by mail.postgresql.org (Postfix) with SMTP id 675A8B5D80A for ; Wed, 17 Aug 2011 15:39:51 -0300 (ADT) Received: (qmail 9488 invoked by uid 453); 17 Aug 2011 18:33:08 -0000 Received: from pc-00002.gpdnet.co.uk (HELO [192.168.1.2]) (192.168.1.2) by gpdnet.co.uk (qpsmtpd/0.83) with (AES256-SHA encrypted) ESMTPS; Wed, 17 Aug 2011 19:33:08 +0100 Message-ID: <4E4C0969.5030401@gpdnet.co.uk> Date: Wed, 17 Aug 2011 19:33:13 +0100 From: Gary Doades User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20110812 Thunderbird/6.0 MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++ References: <959BD2FA-0312-458B-BD5F-ED358D2C47ED@darkstatic.com> <75A85649-2B95-43D5-8404-4776D2E580EC@darkstatic.com> In-Reply-To: <75A85649-2B95-43D5-8404-4776D2E580EC@darkstatic.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-10 required=5 tests=BAYES_00=-1.9 X-Spam-Level: X-Archive-Number: 201108/189 X-Sequence-Number: 44636 On 17/08/2011 7:26 PM, Ogden wrote: > I am using bonnie++ to benchmark our current Postgres system (on RAID > 5) with the new one we have, which I have configured with RAID 10. The > drives are the same (SAS 15K). I tried the new system with ext3 and > then XFS but the results seem really outrageous as compared to the > current system, or am I reading things wrong? > > The benchmark results are here: > > http://malekkoheavyindustry.com/benchmark.html > The results are not completely outrageous, however you don't say what drives, how many and what RAID controller you have in the current and new systems. You might expect that performance from 10/12 disks in RAID 10 with a good controller. I would say that your current system is outrageous in that is is so slow! Cheers, Gary.