well you have 2x disks dont you. Break the mirrors and then you have a free
drive. Setup the pool how you want on this then rsync all your os build over
onto it. Make any zfs root tweaks you want then boot onto the drive.

If all is good then copy across the partition table from the zfs drive to
the new one (gpart backup/restore) and attach the relevent slice/partition
to pool. Finally put the boot blocks onto the drive, job done no work lost


Seems like I crashed all of it along with the mirrors. This worked, though:

- boot from FreeBSD82 digital versatile disk; \
        e.g., FreeBSD-8.2-RELEASE-amd64-dvd1.iso

- select 6 at loader menu

load ahci
load zfs
boot

- fixit > dvd

gpart destroy -F ad4
gpart destroy -F ad6
gpart create -s gpt ad4
gpart add -s 64K -t freebsd-boot ad4
gpart add -s 5G -t freebsd-swap ad4
gpart add -t freebsd-zfs ad4
gpart bootcode -b /dist/boot/pmbr -p /dist/boot/gptzfsboot -i 1 ad4
gpart add -s 64K -t freebsd-boot ad6
gpart add -s 5G -t freebsd-swap ad6
gpart add -t freebsd-zfs ad6
gpart bootcode -b /dist/boot/pmbr -p /dist/boot/gptzfsboot -i 1 ad6
gpart show

mkdir /boot/zfs

zpool create pool0 mirror ad4p3 ad6p3
zpool status -v pool0
zfs set mountpoint=none pool0
zfs create pool0/ROOT
zfs create -o mountpount=/mnt pool0/ROOT/freebsd
zfs create pool0/ROOT/freebsd/tmp
zfs create pool0/ROOT/freebsd/var
zfs create pool0/ROOT/freebsd/usr
zfs create -o mountpoint=/home pool0/HOME

export DESTDIR=/mnt
cd /dist/8.2-RELEASE
for dir in base catpages dict doc info lib32 manpages; \
        do (cd $dir; ./install.sh); done
cd kernels
./install.sh GENERIC
cd ../src
./install.sh all

cd /mnt/boot
cp -Rpv GENERIC/* kernel/

vi /mnt/boot/loader.conf
!--
ahci_load="YES"
zfs_load="YES"
vfs.root.mountfrom="zfs:pool0/ROOT/freebsd"

vi /mnt/etc/rc.conf
!--
zfs_enable="YES"

vi /mnt/etc/fstab
!--
/dev/ad4p2      none    swap    sw              0       0
/dev/ad6p2      none    swap    sw              0       0

cp /boot/zfs/zpool.cache /mnt/boot/zfs/zpool.cache
export LD_LIBRARY_PATH=/dist/lib

cd /
zfs umount -a
zfs set mountpoint=legacy pool0/ROOT/freebsd
zfs set mountpoint=/tmp pool0/ROOT/freebsd/tmp
zfs set mountpoint=/usr pool0/ROOT/freebsd/usr
zfs set mountpoint=/var pool0/ROOT/freebsd/var
zfs set mountpoint=/home pool0/HOME

zpool set bootfs=pool0/ROOT/freebsd pool0

exit
- remove the dvd
exit
exit
yes

Darrel
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