X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 6F3B39DC82F for ; Sat, 7 Jan 2006 14:28:08 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 31912-03 for ; Sat, 7 Jan 2006 14:28:07 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from vms046pub.verizon.net (vms046pub.verizon.net [206.46.252.46]) by postgresql.org (Postfix) with ESMTP id 4AF849DC81A for ; Sat, 7 Jan 2006 14:28:05 -0400 (AST) Received: from osgiliath.mathom.us ([70.108.47.21]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0ISQ00IBFJATYDY2@vms046.mailsrvcs.net> for pgsql-performance@postgresql.org; Sat, 07 Jan 2006 12:28:06 -0600 (CST) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id EC4C06000EE for ; Sat, 07 Jan 2006 13:28:04 -0500 (EST) 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 10006-01 for ; Sat, 07 Jan 2006 13:28:04 -0500 (EST) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id 4B11160013F; Fri, 06 Jan 2006 11:03:12 -0500 (EST) Date: Fri, 06 Jan 2006 11:03:12 -0500 From: Michael Stone Subject: Re: improving write performance for logging In-reply-to: <1136556006.31602.5.camel@spectre.intellivid.com> To: pgsql-performance@postgresql.org Mail-followup-to: pgsql-performance@postgresql.org Message-id: <20060106160311.GH32630@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 References: <43BB0C5C.8020207@computer.org> <1136382865.24450.7.camel@spectre.intellivid.com> <7.0.1.0.2.20060104092139.01c37da0@earthlink.net> <1136390438.24450.49.camel@spectre.intellivid.com> <20060106010822.GK43311@pervasive.com> <1136556006.31602.5.camel@spectre.intellivid.com> User-Agent: Mutt/1.5.11 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.468 required=5 tests=[AWL=-0.337, DATE_IN_PAST_24_48=0.805] X-Spam-Score: 0.468 X-Spam-Level: X-Archive-Number: 200601/49 X-Sequence-Number: 16527 On Fri, Jan 06, 2006 at 09:00:06AM -0500, Ian Westmacott wrote: >We use RAID50 instead of RAID0 for the tables for some fault-tolerance. >We use RAID0 for the WAL for performance. > >I'm missing the implication of the question... If you have the WAL on RAID 0 you have no fault tolerance, regardless of what level you use for the tables. Mike Stone