Cloning question

[Giorgos Keramidas]

On Wed, 26 May 2010 22:33:16 -0400, Steve Bertrand <steve at ipv6canada.com> wrote:
> I've written a few "howto"'s on backup/restore/cloning in the past, but
> now I have a question that I hope to have quickly answered.
>
> I'm not looking for criticism on my approach, only on whether it will
> work. With that said, I'll lay out my scenario and my questions.
>
> Scenario:
>
> - live web server (300 domains), shut the box down and booted up a copy
> of the system on new hardware
>
> - changed the normal system items (nic, fstab etc)
>
> - new box is running fine under old system, but I need to transfer the
> old system data (all of it...*all* data) to the new disk sub-structure
>
> - new box has RAID card, but not compatible w/FBSD
>
> - new box has had RAID card disabled, so new disks show up as standard
> adX drives
>
> Questions:
>
> - while running the 'new' box under the 'old' system, can I:
> --- atacontrol create RAID1 ad4 ad6
> --- fdisk
> --- label: to items under /mnt, as to prepare for copy
>
> - stop all services (or go into single-user), and dump each slice from
> orig to new
>
> ...if so, please advise of the dump command that I'd be using.
>
> Normally I'd use rsync, but this situation can sustain some downtime to
> ensure a complete and utter mirror.

If you want to use dump/restore to copy the root partition from ad0s1a
to ad4s1a you can use:

    # newfs -L NEWROOT /dev/ad4s1a
    # mount -t ufs /dev/ufs/NEWROOT /mnt
    # cd /mnt
    # dump -0auL -C 32 -f - / | restore -rf -

When this is run in single-user mode, the partiion mounted at /mnt
should have a copy of the root filesystem.  Repeat the dump-restore pipe
for other filesystems, e.g.:

    # newfs -L NEWDATA /dev/ad4s2a
    # mount -t ufs /dev/ufs/NEWDATA /mnt/data
    # cd /mnt/data
    # dump -0auL -C 32 -f - /data | restore -rf -

    # newfs -L NEWHOME /dev/ad4s3a
    # mount -t ufs /dev/ufs/NEWHOME /mnt/home
    # cd /mnt/home
    # dump -0auL -C 32 -f - /home | restore -rf -

    ...

When you have dumped all your filesystems to properly mounted graft
points under /mnt, update /mnt/etc/fstab and boot the new disk.