From owner-freebsd-questions@FreeBSD.ORG Thu Dec 11 12:24:23 2003 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 DECCF16A4CE for ; Thu, 11 Dec 2003 12:24:23 -0800 (PST) Received: from blacklamb.mykitchentable.net (67-51-118-244.dsl1.elk.ca.frontiernet.net [67.51.118.244]) by mx1.FreeBSD.org (Postfix) with ESMTP id CDD8643D29 for ; Thu, 11 Dec 2003 12:24:22 -0800 (PST) (envelope-from drew@mykitchentable.net) Received: from l035522 (unknown [165.107.42.110]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by blacklamb.mykitchentable.net (Postfix) with ESMTP id BD3133BF35A; Thu, 11 Dec 2003 12:24:21 -0800 (PST) Message-ID: <00ec01c3c024$bef6d930$6e2a6ba5@lc.ca.gov> From: "Drew Tomlinson" To: "Dru" References: <20031211145245.D637@genisis> Date: Thu, 11 Dec 2003 12:24:14 -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 cc: FreeBSD Questions Subject: Re: dd of mounted filesystem 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: Thu, 11 Dec 2003 20:24:24 -0000 ----- Original Message ----- From: "Dru" Sent: Thursday, December 11, 2003 11:54 AM > Can anyone describe or point me to resources explaining why it is > dangerous to dd a filesystem while it is mounted? Is it still considered > to be dangerous if the system is first dropped down to single-user mode? I'm guessing between this thread and your "unmounting /" thread that you're attempting to duplicate your root drive? I just tried this in single user mode a few days ago with dd and it didn't work. The resulting file system was "dirty" so I used 'fsck' to clean it. The results were a complete unusable mess. I tried another method described in my thread "Trouble Adding New Boot Drive" but couldn't quite get it right. However I think I'm overlooking something quite simple. You might like to look over the steps I took and see if they make sense. Then if you get it to work, I'd be most appreciative if you'd let me know what I missed. I'll send the message to you if you want. Good Luck! Drew