こんなエラーが出始めたら・・・

swap_pager_getswapspace: failed
swap_pager_getswapspace: failed
swap_pager_getswapspace: failed

 # dd if=/dev/zero of=/usr/SWAPFILE bs=1m count=2000

 # vi /etc/rc.conf
 ---追加----
 swapfile="/usr/SWAPFILE"

 # pstat -s
 Device          1K-blocks     Used    Avail Capacity
 /dev/ad0s1b        524288      120   524288     0%
 /dev/md0          2048000      136  2048000     0%
 Total             2572288      256  2572032     0%