From owner-freebsd-questions@FreeBSD.ORG Tue Aug 3 06:10:57 2004 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 59E4A16A4CE for ; Tue, 3 Aug 2004 06:10:57 +0000 (GMT) Received: from mproxy.gmail.com (rproxy.gmail.com [64.233.170.196]) by mx1.FreeBSD.org (Postfix) with ESMTP id F3F6643D62 for ; Tue, 3 Aug 2004 06:10:56 +0000 (GMT) (envelope-from finitesoup@gmail.com) Received: by mproxy.gmail.com with SMTP id 77so76730rnl for ; Mon, 02 Aug 2004 23:10:56 -0700 (PDT) Received: by 10.38.77.63 with SMTP id z63mr197860rna; Mon, 02 Aug 2004 23:10:56 -0700 (PDT) Message-ID: <1e490997040802231017bc78bf@mail.gmail.com> Date: Tue, 3 Aug 2004 08:10:56 +0200 From: Matt To: questions@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: using a disk "mirrored" with dd 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: Tue, 03 Aug 2004 06:10:57 -0000 I have a machine running 4.10-RELEASE-p2 with two identical hard disks -- ad0 and ad2. I would like to make a complete copy of the first disk to the second disk nightly for quick disaster recovery. I've dd'ed the disk as follows # dd if=/dev/ad0 of=/dev/ad2 and edited the disklabel of the second disk to change ad0s1 to ad2s1 as follows # disklabel -e -r ad2 However, I'm still unable to mount the root partion (or any other partition) of the second disk to tweak /etc/fstab etc. even though # mount /dev/ad2s1a /mnt mount: /dev/ad2s1a: Operation not permitted What am I missing? Is there anything else I need to do beyond editing the disklabel to allow me to use the "mirrored" disk? Output of disklabel for the two disks follows: # disklabel ad0 # /dev/ad0c: type: ESDI disk: ad0s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 4864 sectors/unit: 78156162 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 409600 0 4.2BSD 2048 16384 97 # (Cyl. 0 - 25*) b: 5242880 409600 swap # (Cyl. 25*- 351*) c: 78156162 0 unused 0 0 # (Cyl. 0 - 4864*) e: 4194304 5652480 4.2BSD 2048 16384 89 # (Cyl. 351*- 612*) f: 10485760 9846784 4.2BSD 2048 16384 89 # (Cyl. 612*- 1265*) g: 18874368 20332544 4.2BSD 2048 16384 89 # (Cyl. 1265*- 2440*) # disklabel ad2 # /dev/ad2c: type: ESDI disk: ad2s1 label: flags: bytes/sector: 512 sectors/track: 63 tracks/cylinder: 255 sectors/cylinder: 16065 cylinders: 4864 sectors/unit: 78156162 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 8 partitions: # size offset fstype [fsize bsize bps/cpg] a: 409600 0 4.2BSD 2048 16384 97 # (Cyl. 0 - 25*) b: 5242880 409600 swap # (Cyl. 25*- 351*) c: 78156162 0 unused 0 0 # (Cyl. 0 - 4864*) e: 4194304 5652480 4.2BSD 2048 16384 89 # (Cyl. 351*- 612*) f: 10485760 9846784 4.2BSD 2048 16384 89 # (Cyl. 612*- 1265*) g: 18874368 20332544 4.2BSD 2048 16384 89 # (Cyl. 1265*- 2440*) Thanks for any insight, and let me know if you need to see anything else. -Matt