From owner-freebsd-questions@FreeBSD.ORG Fri Jan 14 04:49:10 2005 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 2BEFD16A4CE for ; Fri, 14 Jan 2005 04:49:10 +0000 (GMT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id A2ECD43D1F for ; Fri, 14 Jan 2005 04:49:09 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.13.1/8.13.1) id j0E4n8ZH017193; Thu, 13 Jan 2005 22:49:08 -0600 (CST) (envelope-from dan) Date: Thu, 13 Jan 2005 22:49:08 -0600 From: Dan Nelson To: Matt Emmerton Message-ID: <20050114044908.GA9069@dan.emsphone.com> References: <20050114003814.27395.qmail@web42109.mail.yahoo.com> <005801c4f9d4$a924f110$1200a8c0@gsicomp.on.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <005801c4f9d4$a924f110$1200a8c0@gsicomp.on.ca> X-OS: FreeBSD 5.3-STABLE X-message-flag: Outlook Error User-Agent: Mutt/1.5.6i cc: Drumslayer2 cc: freebsd-questions@freebsd.org Subject: Re: How can I speed up a dd copy? 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: Fri, 14 Jan 2005 04:49:10 -0000 In the last episode (Jan 13), Matt Emmerton said: > > When I am performing a dd between (2) 36 Gig 160 disks (to > > duplicate them) it takes about 2.5 hrs. Is there any way I can > > speed this up? Is there any better way I can clone a bootable main > > disk? > > A larger blocksize (bs=) will help dramatically. Also try double-buffering with ports/misc/team or ports/misc/buffer. -- Dan Nelson dnelson@allantgroup.com