Received: from localhost (maia-1.hub.org [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id 925C39FB409 for ; Mon, 25 Jun 2007 08:38:14 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024) with ESMTP id 70062-08 for ; Mon, 25 Jun 2007 08:38:11 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from vms040pub.verizon.net (vms040pub.verizon.net [206.46.252.40]) by postgresql.org (Postfix) with ESMTP id 3336F9FB400 for ; Mon, 25 Jun 2007 08:38:10 -0300 (ADT) Received: from osgiliath.mathom.us ([71.246.250.91]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JK600H5OWB4JDU8@vms040.mailsrvcs.net> for pgsql-performance@postgresql.org; Mon, 25 Jun 2007 06:37:52 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id D58731F816 for ; Mon, 25 Jun 2007 07:37:50 -0400 (EDT) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath.home.mathom.us [127.0.0.1]) (amavisd-new, port 10024) with LMTP id Sj03+lXZv4hU for ; Mon, 25 Jun 2007 07:37:50 -0400 (EDT) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id 3A1631F80E; Mon, 25 Jun 2007 07:37:49 -0400 (EDT) Date: Mon, 25 Jun 2007 07:37:48 -0400 From: Michael Stone Subject: Re: Performance query about large tables, lots of concurrent access In-reply-to: <467AA77D.3030204@metacarta.com> To: pgsql-performance@postgresql.org Mail-followup-to: pgsql-performance@postgresql.org Message-id: <20070625113746.GY19959@mathom.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-disposition: inline X-Virus-Scanned: Debian amavisd-new at mathom.us X-Pgp-Fingerprint: 53 FF 38 00 E7 DD 0A 9C 84 52 84 C5 EE DF 7C 88 References: <4676DD57.7070304@metacarta.com> <20070620175300.GN30369@alvh.no-ip.org> <46796A08.8080601@metacarta.com> <200706201425.28557.sthomas@leapfrogonline.com> <46799C45.7080805@metacarta.com> <4679AE24.9070005@g2switchworks.com> <4679B6C7.3080207@metacarta.com> <467A9CE5.508@g2switchworks.com> <467AA77D.3030204@metacarta.com> User-Agent: Mutt/1.5.13 (2006-08-11) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.136 tagged_above=0 required=5 tests=BAYES_50=0.001, FORGED_RCVD_HELO=0.135 X-Spam-Level: X-Archive-Number: 200706/565 X-Sequence-Number: 25598 On Thu, Jun 21, 2007 at 12:29:49PM -0400, Karl Wright wrote: >I checked the disk picture - this is a RAID disk array with 6 drives, >with a bit more than 1Tbyte total storage. 15,000 RPM. It would be >hard to get more/faster disk than that. Well, it's not hard to more disk than that, but you'd probably have to look at an external storage array (or more than one). A larger number of larger/slower drives, splitting indices away from data, etc., will almost certainly outperform 6 disks, 15k RPM or not. Mike Stone