code: def get_netapp_data(self):
          
  
          netapp_data = self.server.invoke('volume-list-info')
  
          if netapp_data.results_status() == 'failed':
              self.log.error(
                  'While using netapp API failed to retrieve '
                  'volume-list-info for netapp filer %s' % self.device)
              return
  
          netapp_xml = ET.fromstring(netapp_data.sprintf()).find('volumes')
  
          return netapp_xml
docs: Retrieve netapp volume information
  
              returns ElementTree of netapp volume information