As has become part of our process, we begin the availability analysis by predicting the availability of the individual systems used in this network. Although it would be possible to require more than one calculation per system if the scenarios show differing paths through the devices, we were lucky and the paths through the devices were consistent across all of our scenarios.
We will use the SHARC spreadsheet to perform the calculations. On the more complex systems, we will perform RBDs of the systems. With minor exceptions, the hardware and software contributors to downtime will be accounted for in this section and the remaining contributors added on later.