Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id 6341DB5DC2C for ; Wed, 2 Nov 2011 17:45:23 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 47138-05 for ; Wed, 2 Nov 2011 20:45:16 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0-rc2 Received: from mail-ey0-f174.google.com (mail-ey0-f174.google.com [209.85.215.174]) by mail.postgresql.org (Postfix) with ESMTP id 992BBB5DBCA for ; Wed, 2 Nov 2011 17:45:15 -0300 (ADT) Received: by eye27 with SMTP id 27so524881eye.19 for ; Wed, 02 Nov 2011 13:45:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=HI3H3M+DYmIR638QtMwvxR9ZhI0KwNw5v1OgGfEWd+g=; b=hD/CyIjBKTsLF7TabEsvRbeNOqrQIEBdqkRtuDuVLrpXYg69RP0rCcfkRrWfGNFNYS q57Ko3lcRxbbSfuGb6bhrUhkO+8L4SeucD9pccxpWL+wBYYo8IeHIw5TiuAml3PygDF1 JGdELwIvgXC/DiyxNkIgmcd+Uzuwnm55JkN2c= Received: by 10.213.2.147 with SMTP id 19mr1990588ebj.116.1320266714804; Wed, 02 Nov 2011 13:45:14 -0700 (PDT) Received: from [192.168.73.63] (5357DA75.cm-6-8d.dynamic.ziggo.nl. [83.87.218.117]) by mx.google.com with ESMTPS id q28sm9607015eea.6.2011.11.02.13.45.13 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 02 Nov 2011 13:45:14 -0700 (PDT) Message-ID: <4EB1ABD1.4060405@gmail.com> Date: Wed, 02 Nov 2011 21:45:05 +0100 From: Yeb Havinga User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 MIME-Version: 1.0 To: Merlin Moncure CC: "pgsql-performance@postgresql.org" Subject: Re: Intel 710 pgbench write latencies References: <4EB14002.1020306@gmail.com> <4EB15EB7.2000906@gmail.com> In-Reply-To: <4EB15EB7.2000906@gmail.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=-1.899 tagged_above=-10 required=5 tests=BAYES_00=-1.9, FREEMAIL_FROM=0.001 X-Spam-Level: X-Archive-Number: 201111/29 X-Sequence-Number: 45540 On 2011-11-02 16:16, Yeb Havinga wrote: > On 2011-11-02 15:26, Merlin Moncure wrote: > >> I would keep at least 20-30% of both drives unpartitioned to leave the >> controller room to wear level and as well as other stuff. I'd try >> wiping the drives, reparititoing, and repeating your test. I would >> also compare times through mdadm and directly to the device. > > Good idea. Reinstalled system - > 50% drives unpartitioned. /dev/sdb3 19G 5.0G 13G 29% /ocz /dev/sda3 19G 4.8G 13G 28% /intel /dev/sdb3 on /ocz type ext4 (rw,noatime,nobarrier,discard) /dev/sda3 on /intel type ext4 (rw,noatime,nobarrier,discard) Again WAL was put in a ramdisk. pgbench -i -s 300 t # fits in ram pgbench -c 20 -M prepared -T 300 -l t Intel latency graph at http://imgur.com/Hh3xI Ocz latency graph at http://imgur.com/T09LG