Received: from maia.hub.org (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id 671EB63368B for ; Fri, 26 Mar 2010 01:49:58 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 59151-09 for ; Fri, 26 Mar 2010 04:49:47 +0000 (UTC) X-Greylist: delayed 06:30:11.811225 by SQLgrey-1.7.6 Received: from ormond.site5.com (ormond.site5.com [174.132.150.226]) by mail.postgresql.org (Postfix) with ESMTP id 02791632513 for ; Fri, 26 Mar 2010 01:49:47 -0300 (ADT) Received: from [174.47.2.0] (helo=[10.30.1.224]) by ormond.site5.com with esmtpa (Exim 4.69) (envelope-from ) id 1NuvOp-00017s-EZ for pgsql-performance@postgresql.org; Thu, 25 Mar 2010 17:19:35 -0500 From: Richard Yen Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: good effective_io_concurrency for FusionIO drives? Date: Thu, 25 Mar 2010 15:19:34 -0700 Message-Id: To: pgsql-performance@postgresql.org Mime-Version: 1.0 (Apple Message framework v1077) X-Mailer: Apple Mail (2.1077) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - ormond.site5.com X-AntiAbuse: Original Domain - postgresql.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - richyen.com X-Source: X-Source-Args: X-Source-Dir: X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.001 tagged_above=-10 required=5 tests=BAYES_50=0.001 X-Spam-Level: X-Archive-Number: 201003/333 X-Sequence-Number: 38158 Hello, Wondering what's a good value for effective_io_concurrency when dealing = with FusionIO drives...anyone have any experience with this? I know that SSDs vary from 10 channels to 30, and that 1 SSD about as = fast as a 4-drive RAID, but I can't seem to settle on a good value to = use for effective_io_concurrency. Has anyone done any performance = testing/metrics with the value? Any recommendations or thoughts? --Richard=