From owner-freebsd-questions@FreeBSD.ORG Tue Jan 6 10:11:40 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 0E95F16A4CE for ; Tue, 6 Jan 2004 10:11:40 -0800 (PST) Received: from out005.verizon.net (out005pub.verizon.net [206.46.170.143]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7FB4743D2F for ; Tue, 6 Jan 2004 10:11:38 -0800 (PST) (envelope-from mike@pcmedx.com) Received: from duron.pcmedx.com ([4.46.22.189]) by out005.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040106181137.NTLC16040.out005.verizon.net@duron.pcmedx.com>; Tue, 6 Jan 2004 12:11:37 -0600 Received: from localhost (localhost [127.0.0.1]) by duron.pcmedx.com (Postfix) with ESMTP id 4C296B28F; Tue, 6 Jan 2004 10:11:37 -0800 (PST) Received: from mike (mike.pcmedx.com [192.168.240.244]) by duron.pcmedx.com (Postfix) with SMTP id 95D83B28B; Tue, 6 Jan 2004 10:11:36 -0800 (PST) Message-ID: <014a01c3d480$8f4c4ab0$f4f0a8c0@pcmedx.com> From: "Mike Maltese" To: References: <000201c3d461$eea71770$0301a8c0@office.cpainc.net><012d01c3d47d$40fe8b50$f4f0a8c0@pcmedx.com> <20040106175645.GE38169@dan.emsphone.com> Date: Tue, 6 Jan 2004 10:11:52 -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 out005.verizon.net from [4.46.22.189] at Tue, 6 Jan 2004 12:11:37 -0600 cc: Dan Nelson 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 18:11:40 -0000 > It should go faster than 5MB/sec, though. Seagate's specs say that > drive should do 14MB/sec max. UW's top speed is 40MB/sec, so there > shouldn't be any bottlenecks. 14MB/s is the maximum internal transfer rate. Also, we're talking about write performance here, which will likely be quite a bit slower than read performance. As I said before, a more realistic number should be had with rawio or by measuring actual real-world transfers. Unless all you do is write zeros with dd all day long, I don't think that that is the best measure of performance.