From owner-freebsd-stable Tue Mar 14 13:20:48 2000 Delivered-To: freebsd-stable@freebsd.org Received: from mass.cdrom.com (mass.cdrom.com [204.216.28.184]) by hub.freebsd.org (Postfix) with ESMTP id 5FE9B37B7FB for ; Tue, 14 Mar 2000 13:20:43 -0800 (PST) (envelope-from msmith@mass.cdrom.com) Received: from mass.cdrom.com (localhost [127.0.0.1]) by mass.cdrom.com (8.9.3/8.9.3) with ESMTP id NAA02794; Tue, 14 Mar 2000 13:22:20 -0800 (PST) (envelope-from msmith@mass.cdrom.com) Message-Id: <200003142122.NAA02794@mass.cdrom.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: Stephen Cc: freebsd-stable@FreeBSD.ORG Subject: Re: disk cloning (& a bit of picobsd) In-reply-to: Your message of "Tue, 14 Mar 2000 15:08:15 CST." <20000314150815.A20664@visi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 14 Mar 2000 13:22:19 -0800 From: Mike Smith Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > On Mon, Mar 13, 2000 at 10:14:10AM -0500, Charles N. Owens wrote: > > > > I also am curious as to why use of dd in this way is bad. I've read a number > > of journal articles that advocate its use in just this way (another source, > > O'Reilly's new "Unix Backup & Recovery", by W Curtis Preston talks about its > > flexibility for certain backup/recovery applications). The key thing is to > > _really_ understand the strengths and weaknesses of whatever tool you're > > considering... and to do rigorous testing.... > > > > I'm not a ufs expert, but I had thought the downside to using dd is that it > copies the bad block map from source to target disk, rendering good disk > space unusable. Also, bad blocks on the target disk would never be mapped > out during the usual newfs. Newfs never mapped out bad blocks, and we don't support bad144 anymore, so these are all irrelevant. -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message