If you do not need snapshots then maybe vol copy will do what you need.

vol copy can copy snapshots as well. From 7.2.6.1 vol man page,

vol copy start [ -S | -s snapshot ] source destination

              Copies all data, including snapshots, from one vol-
              ume to another.  If the -S flag is used,  the  com-
              mand  copies  all snapshots in the source volume to
              the destination volume.  To  specify  a  particular
              snapshot  to  copy, use the -s flag followed by the
              name of the snapshot.


 Though I'm not sure this would be any faster than a snapmirror.

Andre, I'd be interested to hear what your outcome of this eventually is.

Thanks,

--
Romeo Theriault
System Administrator
Information Technology Services