Received: from localhost (unknown [200.46.204.182]) by postgresql.org (Postfix) with ESMTP id 323819FA174 for ; Mon, 10 Sep 2007 16:25:13 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.182]) (amavisd-maia, port 10024) with ESMTP id 46283-05 for ; Mon, 10 Sep 2007 16:25:06 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from floppy.pyrenet.fr (news.pyrenet.fr [194.116.145.2]) by postgresql.org (Postfix) with ESMTP id A45A79FA0D1 for ; Mon, 10 Sep 2007 16:25:08 -0300 (ADT) Received: by floppy.pyrenet.fr (Postfix, from userid 106) id D0908342A9; Mon, 10 Sep 2007 21:25:07 +0200 (MET DST) From: "Carlo Stonebanks" X-Newsgroups: pgsql.performance Subject: random_page_costs - are defaults of 4.0 realistic for SCSI RAID 1 Date: Mon, 10 Sep 2007 15:25:41 -0400 Organization: Hub.Org Networking Services Lines: 6 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@news.hub.org X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16480 To: pgsql-performance@postgresql.org X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.157 tagged_above=0 required=5 tests=AWL=0.155, BAYES_50=0.001, STOX_REPLY_TYPE=0.001 X-Spam-Level: X-Archive-Number: 200709/158 X-Sequence-Number: 26703 Can anyone answer this for me: Although I realize my client's disk subsystem (SCSI/RAID Smart Array E200 controller using RAID 1) is less than impressive - is the default setting of 4.0 realistic or could it be lower? Thanks!