Beatm is used to manage boot environments. That can help you to rollback an upgrade in case it makes problems.
To install it:
/usr/ports/sysutils/beadm make install make clean
We have an already existing standard ZFS folder structure. To get this working with boot environments we have to modify it a little bit.
At first we install beadm:
portsnap fetch portsnap extract cd /usr/ports/sysutils/beadm make install clean
Now we clone our existing system and convert it to beadm aware structure:
zfs create -o mountpoint=none zroot/ROOT zfs snapshot zroot@be zfs clone zroot@be zroot/ROOT/default zpool set bootfs=zroot/ROOT/default zroot reboot (before executing this, make sure you are on FreeBSD 9.2 and to pool to boot is not defined in /boot/loader.conf)
Now we can run the beadm tool.
To finish it now, we remove the old structure:
zfs promote zroot/ROOT/default mkdir /mnt/test zfs set mountpoint=/mnt/test zroot cd /mnt/test chflags -R noschg * rm -R * rm -R .* cd .. zfs set mountpoint=none zroot
beadm list beadm activate default reboot