Date: Tue, 3 Aug 2004 09:37:05 -0400 From: Bill Moran <wmoran@potentialtech.com> To: Matt <finitesoup@gmail.com> Cc: questions@freebsd.org Subject: Re: using a disk "mirrored" with dd Message-ID: <20040803093705.6dec1f13.wmoran@potentialtech.com> In-Reply-To: <1e490997040802231017bc78bf@mail.gmail.com> References: <1e490997040802231017bc78bf@mail.gmail.com>
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Matt <finitesoup@gmail.com> wrote: > 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 is your securelevel? See man securelevel. > > 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 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Bill Moran Potential Technologies http://www.potentialtech.com
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