From owner-freebsd-performance@FreeBSD.ORG Sun Oct 2 15:17:05 2005 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 86A5F16A41F for ; Sun, 2 Oct 2005 15:17:05 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from multiplay.co.uk (core6.multiplay.co.uk [85.236.96.23]) by mx1.FreeBSD.org (Postfix) with ESMTP id B172643D48 for ; Sun, 2 Oct 2005 15:17:04 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from vader ([212.135.219.179]) by multiplay.co.uk (multiplay.co.uk [85.236.96.23]) (MDaemon.PRO.v8.1.3.R) with ESMTP id md50001869671.msg for ; Sun, 02 Oct 2005 16:16:05 +0100 Message-ID: <003e01c5c764$3391d720$b3db87d4@multiplay.co.uk> From: "Steven Hartland" To: , "Patrick Proniewski" References: <7035DA0C-E43C-478B-9B1C-6A32545E5E63@patpro.net> Date: Sun, 2 Oct 2005 16:15:58 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2670 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 X-Spam-Processed: multiplay.co.uk, Sun, 02 Oct 2005 16:16:05 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 212.135.219.179 X-Return-Path: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-performance@freebsd.org X-MDAV-Processed: multiplay.co.uk, Sun, 02 Oct 2005 16:16:07 +0100 Cc: Subject: Re: dd(1) performance when copiing a disk to another 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: Sun, 02 Oct 2005 15:17:05 -0000 That's actually pretty good for a sustained read / write on a single disk. Steve ----- Original Message ----- From: "Patrick Proniewski" To: Sent: Sunday, October 02, 2005 3:57 PM Subject: dd(1) performance when copiing a disk to another Hi, (carte mère supermicro chip SATA Intel 6300ESB) I run FreeBSD 5.4 on a PIV 3GHz (SuperMicro motherboard, Intel SATA 6300ESB chipset) with 2 SATA HDD. I'm in the process to duplicate the boot HDD to the second HDD. I run dd for that: # dd if=/dev/ad4 of=/dev/ad6 bs=1m It yields to poor performances: $ iostat -dhKw 1 (...) ad4 ad6 KB/t tps MB/s KB/t tps MB/s 124.49 252 30.69 128.00 246 30.69 128.00 285 35.64 128.00 279 34.90 128.00 282 35.27 128.00 283 35.40 (...) Is it normal that data rate won't go upper than 35/38 MB/s ? HDDs are: ad4 -> Maxtor 80 Go 7200 rpm ad6 -> Hitachi 80 Go 7200 rpm one more question: is dd(1) a good way to duplicate a boot drive to make a bootable spare disk ? patpro_______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.