https://calomel.org/zfs-freebsd-root-install.html
http://www.aisecure.net/2012/01/16/rootzfs
$ cat /etc/make.conf
WITH_PKGNG="YES"
WITH_NEW_XORG="YES"
WITH_PKGNG="YES"
$ cat /etc/rc.conf
hostname="shuttle"
ifconfig_re0="DHCP"
sshd_enable="YES"
moused_enable="YES"
ntpd_enable="YES"
powerd_enable="YES"
dumpdev=”NO” hald_enable=”YES” dbus_enable=”YES” sendmail_enable=”NONE” #kdm4_enable=”YES”
#ifconfig_re0=”inet 192.168.1.1 netmask 255.255.255.0” #defaultrouter=”192.168.1.105” #hostname=”shuttle” gdm_enable=”YES” gnome_enable=”YES” vboxnet_enable=”YES” devfs_system_ruleset=”system”</code>