Best rules of thumb?

Tags:
Availability
Capacity planning
EMC
Hardware
Hitachi Data Systems
IBM
Integration
Mainframe
Storage
Third-party services
Vendor support
What are five best rules of thumb when reviewing output from system monitors for preventing future problems. The system monitors could be any SMF/RMF MICS TSO/MON MXG OMEGAMON system monitor type report for reporting on the mainframe. Example might be 1. sustained CPU utilization over 85% 2. Long I/O ques 3. large variation in on-line response time from off to prime shift . . .ect . . . 4. any utilization reaching 100% just before response times start growing 5. an under paid over worked system administrator with a tooth ach? what do you think?

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1. Murphy is alive and well and following you
2. What seems unrelated probably is related.
3. Change ONLY one variable at a time, unless unrelated. See #2
4. Do not charge down the path before thinking your assumption through

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