mirror ZFS and SVM (storage LUN)

Dear folks,

I configured a server with 2 local disks, managed by ZFS. 

My goal should be to mirror the local disk, only a specific directory /reuters, to a storage LUN, and after mirroring has finished, I want to use the storage LUN instead.

the current situation is -

# zpool status -v

config:

        NAME          STATE     READ WRITE CKSUM

        rpool         ONLINE       0     0     0

          mirror-0    ONLINE       0     0     0

            c0t4d0s0  ONLINE       0     0     0

            c0t5d0s0  ONLINE       0     0     0

# df -h

Filesystem             size   used  avail capacity  Mounted on

.

.

rpool/ROOT/tank        228G    82G    70G    55%    /

rpool/ROOT/tank/var    228G    13G    70G    16%    /var

swap                    13G   120K    13G     1%    /tmp

swap                    13G    24K    13G     1%    /var/run