{'volume_id': volume['id'],
 'targets':[{'type': 'unmanaged',
             'target_name': 'foo',
             'san_ip': '127.0.0.1',
             'san_login': 'admin'...},
            {'type': 'unmanaged',
             'target_name': 'bar',
             'san_ip': '127.0.0.2',
             'san_login': 'admin'...},
            ...]