Confirming that the system-oriented objectives are reasonable

After the system is initialized and monitoring is operational, you need to find out if the objectives themselves are reasonable (that is, achievable, given the hardware available), based upon actual measurements of the workload.

When you measure performance against objectives and report the results to users, you have to identify any systematic differences between the measured data and what the user sees. This means an investigation of the differences between internal (as seen by CICS®) and external (as seen by the end user) measures of response time.

If the measurements differ greatly from the estimates, you must revise application response-time objectives or plan a reduced application workload, or upgrade your system. If the difference is not too large, however, you can embark on tuning the total system. Parts 3 and 4 of this book tell you how to do this tuning activity.

Related tasks
Performance monitoring and review
Deciding on monitoring activities and techniques
Developing monitoring activities and techniques
Planning the performance review process
Planning your monitoring schedule
Reviewing performance data
Typical performance review questions
Anticipating and monitoring system changes and growth
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