'Unlink a snapshot from its target volume.
:param array: the array serial number
:param source_device_id: source volume device id
:param target_device_id: target volume device id
:param snap_name: the name for the snap shot
:param extra_specs: extra specifications'

def break_replication_relationship(self, array, target_device_id, source_device_id, snap_name, extra_specs):

    LOG.debug('Break    snap    vx    link    relationship    between:    %(src)s    and:    %(tgt)s.', {'src': source_device_id, 'tgt': target_device_id})
    self._unlink_volume(array, source_device_id, target_device_id, snap_name, extra_specs)
