From owner-freebsd-mobile Thu Sep 27 23:17: 7 2001 Delivered-To: freebsd-mobile@freebsd.org Received: from cain.gsoft.com.au (genesi.lnk.telstra.net [139.130.136.161]) by hub.freebsd.org (Postfix) with ESMTP id E3BE837B411 for ; Thu, 27 Sep 2001 23:16:57 -0700 (PDT) Received: from cain.gsoft.com.au (root@spare0.gsoft.com.au [203.38.152.114]) by cain.gsoft.com.au (8.8.8/8.8.8) with ESMTP id PAA09762; Fri, 28 Sep 2001 15:46:40 +0930 (CST) (envelope-from doconnor@gsoft.com.au) Message-ID: X-Mailer: XFMail 1.5.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <1001642875.3bb3db7b8c24b@Mail.SavvyWorld.Net> Date: Fri, 28 Sep 2001 15:46:43 +0930 (CST) From: "Daniel O'Connor" To: Edwin Culp Subject: Re: cloning laptop drives Cc: freebsd-mobile@FreeBSD.ORG, kjerste soderberg Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On 28-Sep-2001 Edwin Culp wrote: > AFAIK, the default for dd is one block at a time and that can take for ever. > You need to define the block size to something much larger. I have seen > some > cool formulas based on disk geometry but I never seem to remember them when > I need them.:-( You might try something like > > dd if=/dev/ad0 of=/dev/ad1 bs=8192 > > Hopefully someone will give you a better number. I usually pick 64k when doing this.. Also, if those drives are on the same chain the performance is going to suck really hard.. If you hit 'ctrl-t' you will get some info on dd's progress, and if you run 'systat -vmstat 1' and look at the bottom section you'll see the transfer speeds. --- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message