Received: from localhost (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id 1E59964FD0B for ; Mon, 24 Nov 2008 11:18:23 -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 37957-10 for ; Mon, 24 Nov 2008 11:18:20 -0400 (AST) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.173]) by mail.postgresql.org (Postfix) with ESMTP id 440B164FC44 for ; Mon, 24 Nov 2008 11:18:20 -0400 (AST) Received: by wf-out-1314.google.com with SMTP id 25so2153900wfc.28 for ; Mon, 24 Nov 2008 07:18:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=50plLPg0pCpWaahKOI0/HOPCLobKI1RkkXTLCLii8l0=; b=eT0u2DVDyhaPvgDc4fNknG933IrfY2eK4zv8k779XeDBjkv7Ac3gDK5o1UuyMNllIA itolyacds4kRAH01ZGth1qqYsAg5gBeJazxvlBXd4028MVVEQzi7i7x4qA+8KgsdpU+5 XQoiXByXOvVSb8mfrtwi1WOt4Wsg3y5jzOwYY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=ewDGsQWG1s3v40TvRoE8l5RFvY2HOnZcg36CW6K2VeYNPUMnHfoHfgJo3+cPw30T5j B8FGWg7qW/7qqpjGcUOO+v1quiykfJzH2pm6vsyN5qVNGhdH0zQnywZuMWgaqOSE3HO2 wJvpzYQsmFyWTSMsamJPBCChIWB5XzxkDbQhM= Received: by 10.114.125.18 with SMTP id x18mr1961299wac.220.1227539898702; Mon, 24 Nov 2008 07:18:18 -0800 (PST) Received: by 10.114.137.17 with HTTP; Mon, 24 Nov 2008 07:18:18 -0800 (PST) Message-ID: Date: Mon, 24 Nov 2008 08:18:18 -0700 From: "Scott Marlowe" To: "Glyn Astill" Subject: Re: Perc 3 DC Cc: "Steve Clark" , pgsql-performance@postgresql.org In-Reply-To: <193090.19304.qm@web23608.mail.ird.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <193090.19304.qm@web23608.mail.ird.yahoo.com> 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: 200811/232 X-Sequence-Number: 31963 On Mon, Nov 24, 2008 at 8:06 AM, Glyn Astill wrote: > --- Scott Marlowe wrote: > >> > >> > Yeah the battery is on there, and in the BIOS it says it's >> "PRESENT" and the status is "GOOD". >> >> If I remember correctly, older LSI cards had pretty poor >> performance >> in RAID 1+0 (or any layered RAID really). Have you tried setting >> up >> RAID-1 pairs on the card and then striping them with the OS? >> > > Not yet no, but that's a good suggestion and I do intend to give it a > whirl. I get about 27MB/s from raid 1 (10 is about the same) so > hopefully I can up the throughput to the speed of about one disk with > sw raid. > > For kicks I did try raid 5 on it; 6.9MB/s made it hard to resist > going to get the hammer, which is still a very attractive option. Well, I prefer making keychain fobs still, but from a technical perspective, I guess either option is a good one. Srsly, also look at running pure sw RAID on it with the controller providing caching only. I don't expect a PERC 3DC to win any awards, but the less you give that card to do the better off you'll be.