Evaluating CPU utilization on an MVS system can be quite complex, particularly for a production system. The activity on such systems is already generally monitored and z/OS NFS is simply one more application to be monitored. High level monitoring can be accomplished from the Display Active (DA) display of the System Display and Search Facility (SDSF). This display provides an overview of the total activity on the system. Of particular importance are the CPU usage and relative dispatching priorities of TCP/IP and z/OS NFS. Monitoring tools such as the Resource Measurement Facility (RMF™) Monitor I and Monitor II can provide more detail on the performance characteristics of the MVS system.