Provide a graph model describing virtual and physical elements in a data center

To support a rich set of graph analysis methods during strategy determination we want to have a simple graph model. The graph model should describe how VMs are associated to compute hosts, how virtual networks entities are mapped to physical networks devices, objects/block storage objects to physical storage devices. Furthermore this show how all these entities are interconnected (e.g. showing how two VMs are connected virtually and subsequently through the physical network) This allows for seeing relationships upfront between the entities and hence can be used to identify hot/cold spots in the data center and hence influence a strategy decision.