From owner-freebsd-performance@FreeBSD.ORG Thu Jul 6 02:31:03 2006 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0587116A4DE for ; Thu, 6 Jul 2006 02:31:03 +0000 (UTC) (envelope-from sean@sean.gigave.com) Received: from mailhost.gigavenue.com (mailhost.gigavenue.com [208.66.96.5]) by mx1.FreeBSD.org (Postfix) with ESMTP id 87E0543D46 for ; Thu, 6 Jul 2006 02:31:02 +0000 (GMT) (envelope-from sean@sean.gigave.com) Received: from sean.gigave.com (office.gigavenue.com [208.66.96.66]) by mailhost.gigavenue.com (Postfix) with ESMTP id 28A1C924F1F; Thu, 6 Jul 2006 02:31:02 +0000 (UTC) Received: by sean.gigave.com (Postfix, from userid 501) id 103D5462BB9; Wed, 5 Jul 2006 19:31:02 -0700 (PDT) Date: Wed, 5 Jul 2006 19:31:01 -0700 From: Sean Chittenden To: "Derrick T. Woolworth" Message-ID: <20060706023101.GR17377@Hummer.local> References: <10fd06c60607051802jd9d6158ufd3406465cc64dfc@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <10fd06c60607051802jd9d6158ufd3406465cc64dfc@mail.gmail.com> X-Mailman-Approved-At: Thu, 06 Jul 2006 02:33:14 +0000 Cc: freebsd-performance@freebsd.org Subject: Re: SATA300 Controllers X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2006 02:31:03 -0000 [ Trimmed to just performance@ since disk performance sizing seems to ] [ be a frequently hit upon topic recently. ] > I'm currently trying to build a moderate large system with 4 > presentation servers, 2 database servers and one large storage > system using NFS mapped to ~1.2 terrabyte of SATA disks (4x Maxtor > 500GB 7200 RPM disks w/RAID5 config). Any suggestions? *cough* 4x 50iops per SATA is about 200iops assuming 100% cache miss. Go with 8x 250GB drives instead or do something to increase your spindle count before you spend any time worrying about what SATA card you're using.... unless your disk set is going to fit inside of 64-128MB of RAM, at which point I'd suggest just increasing the number of nbufs instead of spending the bucks on a fancy SATA controller. What's your justification for this machine? Capacity, raw random IOps, or .... -sc -- Sean Chittenden