code: def unregisterSds(self, sdsObj):
          
          self.conn.connection._check_login()
          response = self.conn.connection._do_post("{}/{}{}/{}".format(self.conn.connection._api_url, "instances/Sds::", sdsObj.id, 'action/removeSds'))    
          return response
docs: Unregister SDS from MDM/SIO Cluster
          :param sdsObj: ScaleIO SDS objecty
          :return: POST request response
          :rtype: Requests POST response object