When determining a WLM system weight recommendation, WLM assigns a relative weight to each system in the sysplex, with the highest weight going to the system with the most available capacity. The available capacity is based on the system's available general CPU capacity, and optionally (if there are no systems in the sysplex that are prior to V1R9), available System z® Application Assist Processor (zAAP) capacity and available System z Integrated Information Processor (zIIP) capacity. When PROCTYPE for BASEWLM is configured on the VIPADISTRIBUTE statement, a composite WLM weight is determined by the sysplex distributor based on the WLM weight for each processor type and expected usage of each processor type by an application.
If all systems in the sysplex are running at or near 100%, WLM assigns the highest weights to the systems with the largest amount of lower importance work. In this way, new connection requests are distributed to the systems with the highest displaceable capacity. However, this assumes that the new work is of a high enough importance level to displace this work. A system can be so loaded that only higher importance work is running on that system, in which case the new work request is not able to meet the goals specified in the WLM policy for that server. For more information on how displaceable capacity is calculated and using the Sysplex Routing Services, see z/OS MVS Programming: Workload Management Services.
Use the Netstat VDPT/-O report option with the DETAIL modifier to determine the WLM system weight recommendations for each processor type, along with the modified weight for each processor based on the expected usage proportion configured on the VIPADISTRIBUTE statement.