Date: Tue, 3 Aug 2004 08:10:56 +0200 From: Matt <finitesoup@gmail.com> To: questions@freebsd.org Subject: using a disk "mirrored" with dd Message-ID: <1e490997040802231017bc78bf@mail.gmail.com>
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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
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