WLM considerations for V2R2

This topic describes new WLM functions in z/OS® V2R2:

• WLM specialty engines containment allows WLM administrators to explicitly prevent the overflow of specialty-engine-intensive work to standard processors based on service class. You control this with the Honor Priority attribute of a service class.

  This change was introduced for z/OS® V2R1 with APAR OA50845.

  See z/OS MVS Planning: Workload Management .

  
• Setting an upper memory limit for resource groups allows WLM administrators to specify an upper memory limit for resource groups, and associate address spaces with those resource groups through classification. RSM enforces the defined upper limit.

  By specifying a memory limit, you explicitly restrict physical memory consumption of work that is running in address spaces that are associated with the resource group through classification. For a resource group with a memory limit, the system creates a memory pool. An address space that is associated with the resource group through classification connects to the memory pool. In that case, all its physical frames are backed in the pool. When a memory pool runs low on frames, the system initiates self-stealing to page out memory pool pages and thus free up memory pool frames. This protects the physical memory allocation of other work that is running on the system.

  This change was introduced for z/OS® V2R1 with APAR OA50845.

  See z/OS MVS Planning: Workload Management .

  
• API to make OPT parameters available to monitoring products like RMF and Omegamon: Provides a new WLM service to provide to make the IEAOPTxx parameters available to z/OS monitoring products like RMF and Omegamon.
• Health Based Routing: An enhancement to dynamic workload routing, it focuses on further reducing installation impact due to middleware server health issues. The goal is to mask the impact of a component that appears "sick but not dead" by rerouting work to a healthy back end server.
• Server Management enhancements for large real storage: Fix large real storage problems in SRM and WLM algorithms. The RSM group currently runs large real storage tests.
• Mobile pricing: The ability to classify transactions so that they can benefit from mobile application pricing.