Increase /var/opt size
Can anyone advice how to increase the following /var/opt size?
# zpool status 
  pool: rpool
 state: ONLINE
 scan: resilvered 15.6G in 0h3m with 0 errors on Fri Sep 14 13:39:23 2012
config:
        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            c0d0s0  ONLINE       0     0     0
            c0d1s0  ONLINE       0     0     0
errors: No known data errors
# zfs list 
NAME                     USED  AVAIL  REFER  MOUNTPOINT
rpool                   25.9G  32.7G   106K  /rpool
rpool/ROOT              5.56G  32.7G    31K  legacy
rpool/ROOT/s10sbe0      5.56G  32.7G  4.34G  /
rpool/ROOT/s10sbe0/var  1.22G  32.7G  1.22G  /var
rpool/dump              10.0G  32.7G  10.0G  -
rpool/export              63K  32.7G    32K  /export
rpool/export/home         31K  32.7G    31K  /export/home
