Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id 4F735B5DBD6 for ; Wed, 17 Aug 2011 22:08:17 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.251]) (amavisd-maia, port 10024) with ESMTP id 25014-07 for ; Thu, 18 Aug 2011 01:08:10 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.17.8]) by mail.postgresql.org (Postfix) with ESMTP id 1CC15B5DBC4 for ; Wed, 17 Aug 2011 22:08:10 -0300 (ADT) Received: from [192.168.1.6] (mail.highperformancepostgresql.com [71.179.240.8]) by mrelayeu.kundenserver.de (node=mrbap3) with ESMTP (Nemesis) id 0M1od8-1R9snr27uk-00thoR; Thu, 18 Aug 2011 03:08:09 +0200 Message-ID: <4E4C65F8.2000907@2ndQuadrant.com> Date: Wed, 17 Aug 2011 21:08:08 -0400 From: Greg Smith User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20110702 Icedove/3.0.11 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> <4E4C2FEB.5060301@2ndQuadrant.com> <009f01cc5d3e$bc3bc150$34b343f0$@com> In-Reply-To: <009f01cc5d3e$bc3bc150$34b343f0$@com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V02:K0:OOtYHyi9UyAKgyrk3IMd7ynJ56mbqMD/77Xpsni1iAi Waj0f76bYblS6xWsnD+G7pfsw1ViUp0R69+4jKpjz1D234gLqg DPKSITzifnzE4SFaTOb88RksxJzqc0sNkq6nN8GEmroIaNv/p2 akgZYKmVYwLa2zLTFOmiIvodmX8VZ3Eav1byoQQGAH5MiNJVFb rM9J6rm0faSCwYcheBLg3vz1wOF/GZbDwqhgHB4jbs= 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, RCVD_IN_DNSWL_NONE=-0.0001 X-Spam-Level: X-Archive-Number: 201108/215 X-Sequence-Number: 44662 On 08/17/2011 08:35 PM, mark wrote: > With XFS the mount option is nobarrier. With ext4 I think it is barrier=0 http://www.mjmwired.net/kernel/Documentation/filesystems/ext4.txt ext4 supports both; "nobarrier" and "barrier=0" mean the same thing. I tend to use "nobarrier" just because I'm used to that name on XFS systems. -- Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us