Received: from localhost (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id 7214164FC50 for ; Tue, 9 Dec 2008 08:15:36 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 75207-07 for ; Tue, 9 Dec 2008 08:15:30 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mx.inode.at (mx15.lb01.inode.at [62.99.145.17]) by mail.postgresql.org (Postfix) with ESMTP id 6678D650283 for ; Tue, 9 Dec 2008 08:15:30 -0400 (AST) Received: from [85.124.56.44] (port=8911 helo=[10.192.17.33]) by smartmx-15.inode.at with esmtp (Exim 4.50) id 1LA1Us-0007pp-8b; Tue, 09 Dec 2008 13:15:26 +0100 Message-ID: <493E6159.8040802@sime.com> Date: Tue, 09 Dec 2008 13:15:21 +0100 From: Mario Weilguni User-Agent: Thunderbird 2.0.0.18 (X11/20081125) MIME-Version: 1.0 To: Kevin Grittner CC: pgsql-performance@postgresql.org Subject: Re: Experience with HP Smart Array P400 and SATA drives? References: <4934FE60.30702@sime.com> <49395B57.EE98.0025.0@wicourts.gov> In-Reply-To: <49395B57.EE98.0025.0@wicourts.gov> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200812/64 X-Sequence-Number: 32100 Kevin Grittner schrieb: >>>> Mario Weilguni wrote: >>>> >> Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try >> > to > >> use it with 8x SATA 1TB drives in RAID-5 mode under Linux, and >> > measure > >> strange values. An individual drive is capable of delivering 91 >> > MB/sec > >> sequential read performance, and we get values ~102MB/sec out of a >> 8-drive RAID5, seems to be ridiculous slow. Write performance seems >> > to > >> be much better, ~300 MB /sec - seems ok to me. >> > > What's your stripe size? > > -Kevin > We used the default settings, it's 64k. Might a bigger value help here?