A System Center Capacity Planner 2007 application model defines the performance characteristics of a specific application and its components and is stored within Capacity Planner. Capacity Planner uses these performance characteristics to simulate the performance of a deployed system. Using input that you provide and the particular application model, currently Microsoft Exchange Server, the Capacity Planner Model Wizard generates a capacity model.

Application models stored in Capacity Planner consist of the following:

Hardware Limitations in Capacity Planner Application Models

The hardware modeling limitations for Capacity Planner application models are described in the following table.

Hardware Limitation


Capacity Planner does not actively model memory requirements. Memory requirement recommendations in Capacity Planner are based on best-practice advice for each application model.


Capacity Planner requires single-disk configurations to have write caching disabled. If write caching is enabled on single disks in a test environment, simulation results that are obtained from Capacity Planner do not correspond to the actual test results.


As many as eight processors per server and two cores (dual core) per processor can be modeled.

Switches and routers

Performance is not modeled, although visual indicators for these items are included in the capacity model, appearing in the Model Editor.


Firewalls are not modeled. Capacity Planner models only required infrastructure that affects performance.

Client computers

Overall performance of client computers is not modeled, although network traffic to and from clients is modeled.


Only packet-switched Ethernet networks are modeled. All network connections are full duplex.

See Also