From owner-freebsd-questions@FreeBSD.ORG Tue Jan 6 09:48:01 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 19BBD16A4CE for ; Tue, 6 Jan 2004 09:48:01 -0800 (PST) Received: from out007.verizon.net (out007pub.verizon.net [206.46.170.107]) by mx1.FreeBSD.org (Postfix) with ESMTP id CE84A43D2D for ; Tue, 6 Jan 2004 09:47:58 -0800 (PST) (envelope-from mike@pcmedx.com) Received: from duron.pcmedx.com ([4.46.22.189]) by out007.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040106174758.MAOI9064.out007.verizon.net@duron.pcmedx.com>; Tue, 6 Jan 2004 11:47:58 -0600 Received: from localhost (localhost [127.0.0.1]) by duron.pcmedx.com (Postfix) with ESMTP id 87BBAB28F; Tue, 6 Jan 2004 09:47:57 -0800 (PST) Received: from mike (mike.pcmedx.com [192.168.240.244]) by duron.pcmedx.com (Postfix) with SMTP id D27EDB28B; Tue, 6 Jan 2004 09:47:56 -0800 (PST) Message-ID: <012d01c3d47d$40fe8b50$f4f0a8c0@pcmedx.com> From: "Mike Maltese" To: References: <000201c3d461$eea71770$0301a8c0@office.cpainc.net> Date: Tue, 6 Jan 2004 09:48:12 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: by amavisd (http://www.amavis.org) and f-prot (http://www.f-prot.com) at pcmedx.com X-Authentication-Info: Submitted using SMTP AUTH at out007.verizon.net from [4.46.22.189] at Tue, 6 Jan 2004 11:47:58 -0600 cc: Derek Marcotte Subject: Re: Poor SCSI disk preformance X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Jan 2004 17:48:01 -0000 > I also had (meaning it is not currently attached) a different > SCSI drive attached on the bus, with the same results. Has > anyone any tips for this from a FreeBSD point of view? I wouldn't say that dd is the greatest benchmarking tool. You may want to try benchmarks/rawio. Also, try monitoring diffferent types of transfers to and from another physical disk with iostat. I'm not sure what your speed expectations are, but you're running a 7200 RPM Ultra Wide disk on an Ultra Wide host adapter; not exactly the fastest SCSI technology.