def __get_probe(self, address):
        if address not in self.__probes:
            self.__probes[address] = Probe(self.__id, address)
        return self.__probes[address]
Use the deployer's ``IBlockDeviceAPI`` to attach the volume.
dataset/ETHPy150Open radlab/sparrow/src/main/python/parse_logs.py/Request.__get_probe--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/blockdevice.py/AttachVolume.run