The root filesystem getting full in zfs solaris 10.

Hi,

I am new to ZFS filesystem. In my current setup we have one ZFS server solaris 10.

The root filesystem getting full. I need to help to reduce the same.

The output is below

bash-3.2# df -h

Filesystem             size   used  avail capacity  Mounted on

kpool/ROOT/s10s_u10wos_17b

                        12G   7.8G  1011M    89%    /

/devices                 0K     0K     0K     0%    /devices

ctfs                     0K     0K     0K     0%    /system/contract

proc                     0K     0K     0K     0%    /proc

mnttab                   0K     0K     0K     0%    /etc/mnttab

swap                   1.2G   432K   1.2G     1%    /etc/svc/volatile

objfs                    0K     0K     0K     0%    /system/object

sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab

/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1