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Tuning your environment for Subzero
Tuning is not important in a test environment unless you are evaluating performance or notice a performance problem. However, you should evaluate and tune your environment as needed before implementing BMC Subsystem Optimizer for zEnterprise (Subzero) in production.
You can contact BMC Customer Support to discuss any concerns and how to address them.
Preparing your z/OS environment for Subzero
Subzero redirection activities can increase the load on a z/OS environment. You might need to adjust the environment to ensure that adequate resources are available. Shifting subsystem workloads from one LPAR to another might also shift operating system resources that process client application programs.
Assume that you shift the millions of service units (MSUs) required to process CICS transactions on LPAR 1. As a result, the MSUs required to process the associated subsystem access requests might shift to LPAR 2.
Subzero transports subsystem access requests and their related responses across LPARs. Consequently, the transported data is duplicated across the system, and resides in the memory of both the client and target LPARs. To eliminate stress on memory resources, the Subzero controlling agent acquires data storage for its largest blocks above the bar, in 64-bit common memory objects. Although above-the-bar storage is theoretically inexhaustible, you must assign sufficient system paging packs to manage this storage.
To prepare a z/OS system for Subzero
- Evaluate the number of volumes that are assigned to your paging subsystem, and increase the number if needed.
- Evaluate your CPU assignment percentages, and adjust as needed for possible shifts in resource usage.
Tuning XCF components for Subzero
Subzero redirections use cross-system coupling facility (XCF) resources. Setup XCF using standard procedures and parameters to ensure the functionality of Subzero. Contact BMC Customer support for advice.
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