Cloning ZFS root

• List partitions

parted
unit s
p

• Clone start of disk

dd if=/dev/sdb bs=512 of=80gb.img count=22527 conv=nocreat,notrunc

• Create loop device for partitions

kpartx -a 80gb.img

• Create new pool

zpool create apool /dev/mapper/loop0p2

• Create snapshot on source pool

zfs snapshot -r rpool@cptovm

• Send to new pool

zfs send -R rpool@cptovm | pv | zfs receive -Fd apool

• Export new pool

zpool export apool

• Convert to VMWare image

qemu-img convert -O vmdk ~/VirtualBox\ VMs/zolnascp/80gb.img 80gb.vmdk

• Replace new image in .vmx
• Use Debian ZFS LiveCD in VM to boot from image
• Import apool as rpool

zpool import apool rpool -R /mnt

• mount grub partition

mount /dev/sda1 /mnt/boot/grub

• Setuo chroot env

chroot /mnt
mount -t sysfs sys /sys
mount /proc
mount /dev

• Create new zpool.cache

zpool set cachefile=/etc/zfs/zpool.cache rpool

• set bootfs

zpool set bootfs=rpool/ROOT/ubuntu-1 rpool 

• Update initramfs (should use new cache file) [1]

update-initramfs -c -k all
update-grub
grub-install /dev/sda

That's it...