code: def get_sds_by_name(self,name):
          
          for sds in self.sds:
              if sds.name == name:
                  return sds
          raise KeyError("SDS of that name not found")
docs: Get ScaleIO SDS object by its name
          :param name: Name of SDS
          :return: ScaleIO SDS object
          :raise KeyError: No SDS with specified name found
          :rtype: SDS object