How to increase zfs volume

Hi all,

I would like to know how to increase the volume size (rpool/maxappststapg/disk0) that is assigned to guest domain (maxappststapg). Here is the current mounted file system and volumes:

NAME USED  AVAIL  REFER  MOUNTPOINT

maxpoolprod 85K   547G    31K  /maxpoolprod

rpool 506G  41.6G  81.5K  /rpool

rpool/ROOT 4.38G  41.6G    31K  legacy

rpool/ROOT/solaris          33.2M 41.6G  2.11G  /

rpool/ROOT/solaris-1        4.35G 41.6G  2.31G  /

rpool/ROOT/solaris-1/var     987M  41.6G 454M  /var

rpool/ROOT/solaris/var      28.0M  41.6G 174M  /var

rpool/VARSHARE 142K  41.6G   142K  /var/share

rpool/dump 66.0G  43.6G  64.0G  -

rpool/export 28.9G  41.6G    33K  /export

rpool/export/home           80.5K 41.6G    32K  /export/home