code: def get_sdc_for_volume(self, volObj):
          
          sdcList = []
          if volObj.mapped_sdcs is not None:
              for sdc in volObj.mapped_sdcs:
                  sdcList.append(sdc)
          if len(sdcList) == 0:
              self.conn.logger.debug("No SDCs mapped to volume: %s-(%s)" % (volObj.name, volObj.id))
              return []
          # returning an empty list is
          # valid for snapshots or volumes.
          return sdcList
docs: Get list of SDC mapped to a specific volume
          :param volObj: ScaleIO volume object
          :return: List of ScaleIO SDC objects (empty list if no mapping exist)
          :rtype: SDC object