'Create a replica (snapVx) of a volume group.
:param array: the array serial number
:param source_group: the source group name
:param snap_name: the name for the snap shot
:param extra_specs: extra specifications'

def create_group_replica(self, array, source_group, snap_name, extra_specs):

    LOG.debug('Creating    Snap    Vx    snapshot    of    storage    group:    %(srcGroup)s.', {'srcGroup': source_group})
    self.rest.create_storagegroup_snap(array, source_group, snap_name, extra_specs)
