Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UFquN-0002Iy-5d for pgsql-performance@arkaria.postgresql.org; Wed, 13 Mar 2013 19:00:20 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1UFquM-0003CP-IG for pgsql-performance@arkaria.postgresql.org; Wed, 13 Mar 2013 19:00:14 +0000 Received: from makus.postgresql.org ([2001:4800:7903:4::125]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UFquK-0003Bl-V0 for pgsql-performance@postgresql.org; Wed, 13 Mar 2013 19:00:13 +0000 Received: from 30.55.colo.spiretech.net ([69.168.55.30] helo=lists.commandprompt.com) by makus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UFquI-0004jh-UH for pgsql-performance@postgresql.org; Wed, 13 Mar 2013 19:00:11 +0000 Received: from [192.168.1.5] (spinlock.commandprompt.com [69.168.55.30]) by lists.commandprompt.com (Postfix) with ESMTPA id 8E9A9248; Wed, 13 Mar 2013 12:00:09 -0700 (PDT) Received: from [192.168.1.5] ([71.95.101.172] helo=[192.168.1.5]) by assp.commandprompt.com with ESMTPS(AES256-SHA) (2.1.1); 13 Mar 2013 12:00:08 -0700 Message-ID: <5140CCF7.3060801@commandprompt.com> Date: Wed, 13 Mar 2013 12:01:11 -0700 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130221 Thunderbird/17.0.3 MIME-Version: 1.0 To: Vasilis Ventirozos CC: postgres performance list Subject: Re: Setup of four 15k SAS disk with LSI raid controller References: <6DB0E762-1F85-4824-A018-E23862296FF2@autouncle.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Assp-Version: 2.1.1(11364) on assp.commandprompt.com X-Assp-Client-SSL: yes X-Assp-ID: assp.commandprompt.com m1-01209-04584 X-Assp-Envelope-From: jd@commandprompt.com X-Assp-Intended-For: v.ventirozos@gmail.com X-Assp-Original-Subject: Re: [PERFORM] Setup of four 15k SAS disk with LSI raid controller X-Pg-Spam-Score: -1.9 (-) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org On 03/13/2013 11:45 AM, Vasilis Ventirozos wrote: > Its better to split WAL segments and data just because these two have > different io requirements and because its easier to measure and tune > things if you have them on different disks. Generally speaking you are correct but we are talking about RAID 0 here. JD -- Command Prompt, Inc. - http://www.commandprompt.com/ PostgreSQL Support, Training, Professional Services and Development High Availability, Oracle Conversion, Postgres-XC @cmdpromptinc - 509-416-6579 -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance