Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YvRkn-0004I8-8C for pgsql-admin@arkaria.postgresql.org; Thu, 21 May 2015 14:47:21 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1YvRkm-00040E-5O for pgsql-admin@arkaria.postgresql.org; Thu, 21 May 2015 14:47:20 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1YvRkl-000407-Cy for pgsql-admin@postgresql.org; Thu, 21 May 2015 14:47:19 +0000 Received: from mail4.neteven.com ([5.135.111.119]) by magus.postgresql.org with esmtp (Exim 4.84) (envelope-from ) id 1YvRki-0006Yl-KU for pgsql-admin@postgresql.org; Thu, 21 May 2015 14:47:18 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail4.neteven.com (Postfix) with ESMTP id F2A651F0D4E; Thu, 21 May 2015 16:47:15 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mail4.neteven.com Received: from mail4.neteven.com ([127.0.0.1]) by localhost (mail4.neteven.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dFuUlNvTtvYJ; Thu, 21 May 2015 16:47:15 +0200 (CEST) Message-ID: <555DEFF3.7010803@neteven.com> Date: Thu, 21 May 2015 16:47:15 +0200 From: Thomas SIMON User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Glyn Astill CC: "pgsql-admin@postgresql.org" Subject: Re: Performances issues with SSD volume ? References: <555DCF59.3060808@neteven.com> <1874969609.5822635.1432212392486.JavaMail.yahoo@mail.yahoo.com> In-Reply-To: <1874969609.5822635.1432212392486.JavaMail.yahoo@mail.yahoo.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Pg-Spam-Score: -1.9 (-) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-admin Precedence: bulk Sender: pgsql-admin-owner@postgresql.org Le 21/05/2015 14:46, Glyn Astill a écrit : >> From: Thomas SIMON >> To: Glyn Astill >> Cc: "pgsql-admin@postgresql.org" >> Sent: Thursday, 21 May 2015, 13:28 >> Subject: Re: [ADMIN] Performances issues with SSD volume ? >> >> >> disk was already in noop mode >> >> cat /sys/block/sdc/queue/scheduler >> noop [deadline] cfq >> >> > > No, the output shows the i/o scheduler between the brackets. That says it's deadline for sdc. > > Of course deadline may well be the better option for you, but it's worth testing. You're totally right. I changed parameter to noop and redo pgbench test, but I've seen no significantly differences. -- Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin