SimulationMode

This is how the SimulationMode property can be changed or listed:

$ TngUtility.py --simList 
  List the SimulationMode property of all devices.

$ TngUtility.py --simList dgg mca
  List the SimulationMode property of selected devices.

$ TngUtility.py --simOn 
  Sets the SimulationMode property of all devices to 1.

$ TngUtility.py --simOn dgg mca
  Sets the SimulationMode property of the selected devices to 1.

$ TngUtility.py --simOff dgg mca
  Sets the SimulationMode property of the selected devices to 0.

Notice that the servers have to be restarted in order to let property changes come into effect.