'This just breaks the replication.
If we find the source we just delete the replication.  If the source
is down then we find the destination and unmap it.  Fail pretty much
every time this goes south.
:param volumename: Volume name is the guid from the cinder volume.
:param instance_id: Storage Center volume object instance id.
:param destssn: Destination ssn.
:return: Replication SC volume object.'

def break_replication(self, volumename, instance_id, destssn):

    replinstanceid = None
    scvolume = self.find_volume(volumename, instance_id)
    if scvolume:
        screplication = self.get_screplication(scvolume, destssn)
        if screplication:
            replinstanceid = screplication['destinationVolume']['instanceId']
    screplvol = self.find_repl_volume(self._repl_name(volumename), destssn, replinstanceid)
    if self.remove_mappings(screplvol):
        self.remove_mappings(scvolume)
    return screplvol
