From owner-freebsd-performance@FreeBSD.ORG Mon Jan 3 19:33:31 2005 Return-Path: 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 D1F4516A4CE for ; Mon, 3 Jan 2005 19:33:30 +0000 (GMT) Received: from stewie.obfuscated.net (stewie.obfuscated.net [66.118.188.125]) by mx1.FreeBSD.org (Postfix) with ESMTP id 92F1A43D2D for ; Mon, 3 Jan 2005 19:33:30 +0000 (GMT) (envelope-from meconlen@obfuscated.net) Received: from [192.168.1.101] (653259hfc120.tampabay.rr.com [65.32.59.120]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by stewie.obfuscated.net (Postfix) with ESMTP id EA75B6137 for ; Mon, 3 Jan 2005 14:33:29 -0500 (EST) Mime-Version: 1.0 (Apple Message framework v619) Content-Transfer-Encoding: 7bit Message-Id: <3F362419-5DBE-11D9-B88F-00039367611E@obfuscated.net> Content-Type: text/plain; charset=US-ASCII; format=flowed To: freebsd-performance@freebsd.org From: Michael E.Conlen Date: Mon, 3 Jan 2005 14:32:46 -0500 X-Mailer: Apple Mail (2.619) Subject: FC Disk array X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jan 2005 19:33:31 -0000 I have a system connected to a IBM Fast-t 100 fiber channel disk array that I'm using as an NFS server. It's handling a moderate load of write operations, normally in the range of 4 to 8 MB/sec with an average write size of 16k constantly. The odd thing I've noticed in gstat and systat is that the system reports the disk as over 100% busy at times. I once saw it as high as 150%. I don't care that it does this, but it makes me wonder what the ceiling is. The system is a dual Xeon HT with hlt_logical_cpu set to 0 so I'm used to getting 400% worth of CPU in some of my metrics. -- Michael Conlen meconlen@obfuscated.net