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Z Performance – Introduction to Mainframe Performance z/OS 2.5


3 hours



The Introduction to Mainframe Performance course provides the learner with a core understanding of what performance measures are required when managing a mainframe environment. Measuring the usage of critical resources is discussed, and potential issues that can affect the performance of tasks running in a z/OS system are presented.


This course is suitable for IT specialists whose role is to manage the performance and capacity requirements of a z/OS system.


Completion of the following Interskill courses:

  • IBM (z/OS) – The Evolving Mainframe
  • IBM (z/OS) – Working with the Mainframe
  • z/OS – Concepts

or equivalent knowledge.


After completing this course, the student will be able to:

  • Describe what z/OS systems performance tuning entails
  • Identify tools and other available resources used for performance and tuning activities
  • Explain why CPU usage and capacity need to be measured and reported
  • Describe different metrics used to express CPU usage and capacity
  • Determine CPU usage and capacity for a z/OS system

Course Content

Introduction to z/OS Performance

Identifying z/OS Components Requiring Performance Monitoring
Target Performance
Determining performance levels using SLAs and SLOs
Performance Identification, and Measurement
Options for Resolving Performance Problems
The Performance Cycle
System vs Application Performance
Performance Tools and Resources
Using RMF Monitors to Display z/OS Performance
Other Performance Monitoring Tools

CPU Measurement

Why CPU is Measured?
CPU Costs
Limiting CPU Usage
Identifying CPU Usage Statistics
Millions of Service Units per Hour (MSU)
LSPR and Capacity
Millions of Instructions per Second (MIPS)
CPU Usage Data in SMF Type 30, 70, and 72 Records
Monitors Used to Obtain CPU Usage
Capture Ratio

Z Performance – Introduction to Mainframe Performance z/OS 2.5 Mastery Test