The capacity of the system is influenced by both its availability and the capacity of its components. The capacity values for the blocks in the diagram and the configuration of the system are used to calculate the total system capacity. When you run RBD calculations, you supply the fixed and variable costs associated with either downtime or the loss of capacity on the Downtime page in the Calculate window. For more information, see RBD Calculation Properties.

For a block with load-sharing redundancy, the capacity specified for the block is the base capacity of the block when all components that are carrying the load are operating. If a component sharing the load goes offline, the capacity of each remaining component increases with the load at a 1-to-1 ratio. For example, if the load on components goes up by 20%, the capacity for components also goes up by 20%. Conversely, if the failed component comes back on line, the load on components goes down by 20%, and so does the capacities of the components. Interactions specific to a block with load-sharing redundancy information are described in Load-Sharing Notes.