Mine

altoid# metadb -a -f c0t0d0s7

altoid# metadb -a c0t1d0s7

altoid# metainit -f d10 1 1 c0t0d0s0

altoid# metainit d11 1 1 c0t1d0s0

altoid# metainit d0 -m d10

altoid# metaroot d0

altoid# lockfs -fa

altoid# init 6

altoid# metattach d0 d11

altoid# metastat

altoid# metadb -a c1t1d0s7

altoid# metadb -a c1t2d0s7

altoid# metainit d20 1 1 c1t1d0s0
 
altoid# metainit d21 1 1 c1t2d0s0

altoid# metainit d1 -m d20

altoid# metattach d1 d21

altoid# metadb -a c1t3d0s7

altoid# metainit d30 1 1 c1t3d0s0

altoid# metainit d2 -m d30

altoid# metainit d31 1 1 c1t4d0s0

altoid# prtvtoc -h /dev/rdsk/c1t3d0s2 | fmthard -s - /dev/rdsk/c1t4d0s2
fmthard:  New volume table of contents now in place.

        # For your own peace of mind, do the following:
altoid# prtvtoc -h /dev/rdsk/c1t3d0s2 
       0      0    00          0  35156232  35156231
       2      5    01          0  35368272  35368271
       7      0    00   35156232    212040  35368271
altoid# prtvtoc -h /dev/rdsk/c1t4d0s2 
       0      0    00          0  35156232  35156231
       2      5    01          0  35368272  35368271
       7      0    00   35156232    212040  35368271

altoid# metattach d2 d31
d2: submirror d31 is attached