[[ZFS mountpoint]] blackcube2# freebsd-update fetch したら、 WARNING: FreeBSD 9.0-RELEASE is approaching its End-of-Life date. It is strongly recommended that you upgrade to a newer release within the next 4 weeks. と、言われたんで、念のために freebsd-update fetch freebsd-update install してから、 freebsd-update upgrade -r 9.1-RELEASE