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 16E33D953D for ; Sun, 25 Sep 2005 12:43:26 -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 62710-03 for ; Sun, 25 Sep 2005 15:43:21 +0000 (GMT) Received: from hosting.commandprompt.com (128.commandprompt.com [207.173.200.128]) by svr1.postgresql.org (Postfix) with ESMTP id EFF76D9186 for ; Sun, 25 Sep 2005 12:43:20 -0300 (ADT) Received: from [192.168.1.100] (clbb-248.saw.net [64.146.135.248]) (authenticated bits=0) by hosting.commandprompt.com (8.13.4/8.13.4) with ESMTP id j8PFcHH2007334; Sun, 25 Sep 2005 08:38:18 -0700 Message-ID: <4336C57B.6090800@commandprompt.com> Date: Sun, 25 Sep 2005 08:42:51 -0700 From: "Joshua D. Drake" User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050912) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Dave Cramer Cc: Michael Ben-Nes , PFC , pgsql-performance@postgresql.org Subject: Re: Advice on RAID card References: <43367937.40809@canaan.co.il> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (hosting.commandprompt.com [192.168.1.101]); Sun, 25 Sep 2005 08:38:18 -0700 (PDT) X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.02 required=5 tests=[AWL=0.020] X-Spam-Level: X-Archive-Number: 200509/333 X-Sequence-Number: 14641 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 ? The common explanation is that CPUs are so fast now that it doesn't make a difference. From my experience software raid works very, very well. However I have never put software raid on anything that is very heavily loaded. I would still use hardware raid if it is very heavily loaded. Sincerely, Joshua D. Drake -- Your PostgreSQL solutions company - Command Prompt, Inc. 1.800.492.2240 PostgreSQL Replication, Consulting, Custom Programming, 24x7 support Managed Services, Shared and Dedicated Hosting Co-Authors: plPHP, plPerlNG - http://www.commandprompt.com/