X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 26280DB7B3 for ; Tue, 15 Nov 2005 10:55:46 -0400 (AST) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 38857-10 for ; Tue, 15 Nov 2005 14:55:48 +0000 (GMT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from vms040pub.verizon.net (vms040pub.verizon.net [206.46.252.40]) by svr1.postgresql.org (Postfix) with ESMTP id BE4E1DB6AA for ; Tue, 15 Nov 2005 10:55:42 -0400 (AST) Received: from osgiliath.mathom.us ([70.108.64.202]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IQ000CK444YHVND@vms040.mailsrvcs.net> for pgsql-performance@postgresql.org; Tue, 15 Nov 2005 08:55:46 -0600 (CST) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id D038C607898; Tue, 15 Nov 2005 09:55:45 -0500 (EST) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 04523-02-5; Tue, 15 Nov 2005 09:55:45 -0500 (EST) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id B20576063FF; Tue, 15 Nov 2005 09:55:45 -0500 (EST) Date: Tue, 15 Nov 2005 09:55:45 -0500 From: Michael Stone Subject: Re: Hardware/OS recommendations for large databases ( In-reply-to: <3E37B936B592014B978C4415F90D662D01995FD4@MI8NYCMAIL06.Mi8.com> To: Luke Lonergan Cc: pgsql-performance@postgresql.org Mail-followup-to: Luke Lonergan , pgsql-performance@postgresql.org Message-id: <20051115145545.GQ9905@mathom.us> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-disposition: inline X-Pgp-Fingerprint: 53 FF 38 00 E7 DD 0A 9C 84 52 84 C5 EE DF 7C 88 X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at mathom.us References: <3E37B936B592014B978C4415F90D662D01995FD4@MI8NYCMAIL06.Mi8.com> User-Agent: Mutt/1.5.11 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0 required=5 tests=[none] X-Spam-Score: 0 X-Spam-Level: X-Archive-Number: 200511/248 X-Sequence-Number: 15505 On Tue, Nov 15, 2005 at 09:33:25AM -0500, Luke Lonergan wrote: >write performance is now up to par with the best cards I believe. We >find that you still need to set Linux readahead to at least 8MB >(blockdev --setra) to get maximum read performance on them, is that your What on earth does that do to your seek performance? Mike Stone