Considerations for coupling facilities running on uniprocessor models

On a uniprocessor or smaller model, It is strongly recommended that coupling facility LPs should not share general purpose CPs with non-CF workloads (for example, z/OS), even in a test environment. While it is possible to use general purpose CPs as CF processors and share the CPs with z/OS and other similarly defined CFs, this is not a recommended configuration. Using CPs as CF processors creates interaction between z/OS and the CF in terms of cache reuse and other factors that may impact performance. For production configurations, It is strongly recommended to use one or more Internal Coupling Facility (ICFs) for the coupling facility LPs.

For a test configuration, if this option is not available and coupling facility LPs must share a general purpose CP with non-CF workloads, adherence to the preceding recommendations for coupling facilities using shared CPs minimize undesirable consequences.