1. Create ZFS filesystem hierarchy

The fletcher4 algorithm should be more robust than the fletcher2 algorithm. 

Fixit# zfs set checksum=fletcher4					zroot
Fixit# zfs create -o compression=on	-o exec=on	-o setuid=off	zroot/tmp
Fixit# chmod 1777 /zroot/tmp
Fixit# zfs create							zroot/usr
Fixit# zfs create							zroot/usr/home
Fixit# cd /zroot ; ln -s /usr/home home
Fixit# zfs create -o compression=lzjb 			-o setuid=off	zroot/usr/ports
Fixit# zfs create -o compression=off	-o exec=off	-o setuid=off	zroot/usr/ports/distfiles
Fixit# zfs create -o compression=off	-o exec=off	-o setuid=off	zroot/usr/ports/packages
Note:

If you use nullfs or nfs to mount /usr/ports to different locations/servers, you will also need to nullfs/nfs mount /usr/ports/distfiles and/or /usr/ports/packages. 

Fixit# zfs create -o compression=lzjb 	-o exec=off	-o setuid=off	zroot/usr/src
Fixit# zfs create							zroot/var
Fixit# zfs create -o compression=lzjb 	-o exec=off	-o setuid=off	zroot/var/crash
Fixit# zfs create			-o exec=off	-o setuid=off	zroot/var/db
Fixit# zfs create -o compression=lzjb 	-o exec=on	-o setuid=off	zroot/var/db/pkg
Fixit# zfs create			-o exec=off	-o setuid=off	zroot/var/empty
Fixit# zfs create -o compression=lzjb 	-o exec=off	-o setuid=off	zroot/var/log
Fixit# zfs create -o compression=gzip 	-o exec=off	-o setuid=off	zroot/var/mail
Fixit# zfs create			-o exec=off	-o setuid=off	zroot/var/run
Fixit# zfs create -o compression=lzjb 	-o exec=on	-o setuid=off	zroot/var/tmp
Fixit# chmod 1777 /zroot/var/tmp
Note:
  1. Compression may be set to on, off, lzjb, gzip, gzip-N (where N is an integer from 1 (fastest) to 9 (best compression ratio. gzip is equivalent to gzip-6).
  2. Compression will cause some latency when accessing files on the ZFS filesystems. Use compression on ZFS filesystems which will not be accessed that often.
  1. Install FreeBSD to zroot
Fixit# cd /dist/8.0-*
Fixit# export DESTDIR=/zroot
Fixit# for dir in base catpages dict doc games info lib32 manpages ports; \
  do (cd $dir ; ./install.sh) ; done
Fixit# cd src ; ./install.sh all
Fixit# cd ../kernels ; ./install.sh generic
Fixit# cd /zroot/boot ; cp -Rlp GENERIC/* /zroot/boot/kernel/
  1. Make /var/empty readonly
Fixit# zfs set readonly=on zroot/var/empty
  1. chroot into /zroot
Fixit# chroot /zroot
  1. Create /etc/rc.conf
Fixit# echo 'zfs_enable="YES"' > /etc/rc.conf
Fixit# echo 'hostname="beastie.mydomain.local"' >> /etc/rc.conf
Fixit# echo 'ifconfig_re0="DHCP"' >> /etc/rc.conf
Note:

Replace re0 with the name of the Network interface for the new system

  1. Create /boot/loader.conf
Fixit# echo 'zfs_load="YES"' > /boot/loader.conf
Fixit# echo 'vfs.root.mountfrom="zfs:zroot"' >> /boot/loader.conf
  1. Change root's password
Fixit# passwd
  1. Set the local time zone
Fixit# tzsetup
  1. Create /etc/mail/aliases.db
Fixit# cd /etc/mail
Fixit# make aliases
  1. Exit from the /zroot
Fixit# umount /dev
Fixit# exit
  1. Install zpool.cache to the ZFS filesystem
Fixit# cp /boot/zfs/zpool.cache /zroot/boot/zfs/zpool.cache