This section discusses aspects of the MVS™ workload manager under the following headings:
MVS/ESA 5.1 and later includes the MVS workload manager, which provides automatic,
dynamic, balancing of system resources (central processors and storage) across
a sysplex by:
- Adopting a goal-oriented approach
- Gathering real-time data from the subsystems that reflect performance
at an individual task level
- Monitoring MVS- and subsystem-level delays and waits that are contributing
to overall task execution times
- Dynamically managing the sysplex’s resources, using the performance
goals, and the real-time performance and delay data, as inputs to system resource
management algorithms.
This is particularly significant in a sysplex environment, but is also
of value to subsystems running in a single MVS image.
To help you migrate to goal-oriented workload management, you can run any MVS image in a sysplex
in compatibility mode, using the performance management
tuning methods of releases of MVS before MVS/ESA 5.1.
Notes:
- If you do not want to use the MVS workload management facility, you should review your MVS performance
definitions to ensure that they are still appropriate for CICS® Transaction Server for z/OS®, Version 3 Release 1. To do
this, review parameters in the IEAICS and IEAIPS members of the MVS PARMLIB library.
For more information about these MVS performance definitions, see the z/OS MVS Initialization and Tuning Guide.
- If
you use CICSPlex® SM to control dynamic routing in a CICSplex or BTS-plex, you can
base its actions on the CICS response time goals of the CICS transactions as defined to the MVS workload manager.
See CICSPlex SM workload management. For full details, see the CICSPlex System Manager Managing Workloads manual.
The benefits of using MVS workload manager are:
- Improved performance through MVS resource management
The improvement
is likely to depend on many factors, for example:
- System hardware configuration
- The way the system is partitioned
- Whether CICS subsystems are single or multi-region
- The spread of types of applications or tasks performed, and the diversity
of their profile of operation
- The extent to which the sysplex workload changes dynamically.
- Improved efficiency of typical MVS sysplexes
- Improved overall capacity
- Increased work throughput.
- Simplified MVS tuning
Generally, systems whose operating signature makes attaining
or maintaining optimal tuning difficult or time consuming to achieve by current
means will tend to obtain the greater benefit.
The main benefit is that you no longer have to continually monitor and
tune CICS to achieve optimum performance. You can set your workload objectives
in the service definition and let the workload component of MVS manage the resources
and the workload to achieve your objectives.
The MVS workload manager produces performance reports that you can use to establish reasonable
performance goals and for capacity planning.
The CICS function for MVS workload management incurs negligible impact on CICS storage.
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