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 1837FD959F for ; Sun, 25 Sep 2005 12:59:13 -0300 (ADT) 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 67875-04 for ; Sun, 25 Sep 2005 15:59:11 +0000 (GMT) Received: from vms046pub.verizon.net (vms046pub.verizon.net [206.46.252.46]) by svr1.postgresql.org (Postfix) with ESMTP id 35967D958C for ; Sun, 25 Sep 2005 12:59:10 -0300 (ADT) Received: from osgiliath.mathom.us ([70.108.61.78]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IND007QDR2L7Z37@vms046.mailsrvcs.net> for pgsql-performance@postgresql.org; Sun, 25 Sep 2005 10:59:10 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by osgiliath.mathom.us (Postfix) with ESMTP id 335AE60036E for ; Sun, 25 Sep 2005 11:59:09 -0400 (EDT) Received: from osgiliath.mathom.us ([127.0.0.1]) by localhost (osgiliath [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 01708-05-2 for ; Sun, 25 Sep 2005 11:59:09 -0400 (EDT) Received: by osgiliath.mathom.us (Postfix, from userid 1000) id 18A2960034E; Sun, 25 Sep 2005 11:59:09 -0400 (EDT) Date: Sun, 25 Sep 2005 11:59:09 -0400 From: Michael Stone Subject: Re: Advice on RAID card In-reply-to: To: pgsql-performance@postgresql.org Mail-Followup-To: pgsql-performance@postgresql.org Message-id: <20050925155909.GB18077@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: <43367937.40809@canaan.co.il> User-Agent: Mutt/1.5.10i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.004 required=5 tests=[AWL=0.004] X-Spam-Level: X-Archive-Number: 200509/332 X-Sequence-Number: 14640 On Sun, Sep 25, 2005 at 10:57:56AM -0400, Dave Cramer wrote: >I would think software raid would be quite inappropriate considering >postgres when it is working is taking a fair amount of CPU as would >software RAID. Does anyone know if this is really the case ? It's not. Modern cpu's can handle raid operations without even noticing. At the point where your raid ops become a significant fraction of the cpu you'll be i/o bound anyway. Mike Stone