code: def _configDevActive(self, namestr, titlestr, devlist):
          
          name = 'diskio_%s_active' % namestr
          if self.graphEnabled(name):
              graph = MuninGraph('Disk I/O - %s - Queue Length' % titlestr, 
                  self._category,
                  info='Disk I/O - Number  of I/O Operations in Progress for every %s.'
                       % titlestr,
                  args='--base 1000 --lower-limit 0', printf='%6.1lf',
                  autoFixNames = True)
              for dev in devlist:
                  graph.addField(dev, 
                                 fixLabel(dev, maxLabelLenGraphSimple, 
                                          repl = '..', truncend=False,
                                          delim = self._labelDelim.get(namestr)), 
                                 draw='AREASTACK', type='GAUGE', info=dev)
              self.appendGraph(name, graph)
docs: Generate configuration for I/O Queue Length.
          
          @param namestr:  Field name component indicating device type.
          @param titlestr: Title component indicating device type.
          @param devlist:  List of devices.