umount /dev/md1
mdmfs -s 1024M md1 /tmp

gpart destroy -F ada0

gpart create -s gpt ada0

gpart add -b 34 -s 64k -t freebsd-boot ada0
gpart add -t freebsd-zfs -l disk0 ada0
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ada0

zpool destroy rpool
# używamy -f jeżeli wcześniej był zpool
zpool create -f rpool /dev/gpt/disk0

zfs set checksum=fletcher4 rpool
zfs create rpool/root
zfs set mountpoint=none rpool
zfs set mountpoint=/mnt rpool/root

zfs create -o canmount=off  rpool/root/usr
zfs create  -o canmount=off rpool/root/var
zfs create -o compression=on -o exec=on -o setuid=off rpool/root/tmp
zfs create -o compression=gzip -o setuid=off  rpool/root/usr/ports
zfs create -o compression=off -o exec=off -o setuid=off rpool/root/usr/ports/distfiles
zfs create -o compression=off -o exec=off -o setuid=off rpool/root/usr/ports/packages
zfs create -o compression=gzip -o exec=off -o setuid=off  rpool/root/usr/src
zfs create -o compression=lzjb rpool/root/usr/obj
zfs create -o compression=lzjb  -o exec=off     -o setuid=off   rpool/root/var/crash
zfs create -o compression=off -o exec=off -o setuid=off   rpool/root/var/empty
zfs create -o compression=lzjb  -o exec=on -o setuid=off   rpool/root/var/tmp

zpool export rpool
zpool import -o cachefile=/tmp/zpool.cache rpool
chmod 1777 /mnt/tmp
chmod 1777 /mnt/var/tmp

sh
cd /usr/freebsd-dist
export DESTDIR=/mnt
for file in base.txz lib32.txz kernel.txz doc.txz ports.txz src.txz;
do (cat $file | tar --unlink -xpJf - -C ${DESTDIR:-/}); done

cp /tmp/zpool.cache /mnt/boot/zfs/zpool.cache
echo 'zfs_enable="YES"' >> /mnt/etc/rc.conf
echo 'zfs_load="YES"' >> /mnt/boot/loader.conf
echo 'vfs.root.mountfrom="zfs:rpool/root"' >> /mnt/boot/loader.conf

zfs set readonly=on rpool/root/var/empty
touch /mnt/etc/fstab
zfs umount -a

zfs set mountpoint=legacy rpool/root
zfs set mountpoint=/tmp rpool/root/tmp
zfs set mountpoint=/usr rpool/root/usr
zfs set mountpoint=/var rpool/root/var
zpool set bootfs=rpool/root rpool
zfs create -V 2G rpool/swap
zfs set checksum=off rpool/swap
zfs set org.freebsd:swap=on rpool/swap

Filesystem             Size    Used   Avail Capacity  Mounted on
system/root            5.7G    429M    5.3G     7%    /
devfs                  1.0K    1.0K      0B   100%    /dev
squid                   16G     27K     16G     0%    /squid
squid/cache             17G    303M     16G     2%    /squid/cache
squid/log               16G    5.2M     16G     0%    /squid/log
system/tmp             5.3G     16M    5.3G     0%    /tmp
system/usr              10G    5.1G    5.3G    49%    /usr
system/usr/ports       6.0G    723M    5.3G    12%    /usr/ports
system/var             6.5G    1.2G    5.3G    19%    /var