Newbie for solaris 10 and zfs

I have a Sun T2000 machines and require to reinstall the OS (Solaris 10 05/09).
During installation, it prompts me about using UFS/ZFS and I'd chosen ZFS and choose to separate /root and /var.

After installation, it displays the following:

Filesystem            kbytes    used   avail capacity  Mounted on
rpool/ROOT/s10s_u7wos_08
                     69672960 5614611 56828127     9%    /
/devices                   0       0       0     0%    /devices
ctfs                       0       0       0     0%    /system/contract
proc                       0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
swap                 8731104    1560 8729544     1%    /etc/svc/volatile
objfs                      0       0       0     0%    /system/object
sharefs                    0       0       0     0%    /etc/dfs/sharetab
/platform/SUNW,Sun-Fire-T200/lib/libc_psr/libc_psr_hwcap1.so.1
                     62442738 5614611 56828127     9%    /platform/sun4v/lib/libc_psr.so.1
/platform/SUNW,Sun-Fire-T200/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
                     62442738 5614611 56828127     9%    /platform/sun4v/lib/sparcv9/libc_psr.so.1
fd                         0       0       0     0%    /dev/fd
rpool/ROOT/s10s_u7wos_08/var
                     69672960   68478 56828127     1%    /var
swap                 8729576      32 8729544     1%    /tmp
swap                 8729576      32 8729544     1%    /var/run
rpool/export         69672960      20 56828127     1%    /export
rpool/export/home    69672960 3490068 56828127     6%    /export/home
rpool                69672960      94 56828127     1%    /rpool


-----------------------------------------------------------------


bash-3.00# zfs list
NAME                           USED  AVAIL  REFER  MOUNTPOINT
rpool                         12.2G  54.2G    94K  /rpool
rpool/ROOT                    5.42G  54.2G    18K  legacy
rpool/ROOT/s10s_u7wos_08      5.42G  54.2G  5.35G  /
rpool/ROOT/s10s_u7wos_08/var  66.9M  54.2G  66.9M  /var
rpool/dump                    1.50G  54.2G  1.50G  -
rpool/export                  3.33G  54.2G    20K  /export
rpool/export/home             3.33G  54.2G  3.33G  /export/home
rpool/swap                       2G  56.2G    16K  -

It seems that the /root shares the space with /var
How can I separate the /var?
Do I need to backup and create a new pool?

Thanks.

/var is a separate filesystem from / in your setup.
You can set a quota on /var if you want it not to affect the remaining filesystems.