Question

Best rules of thumb?

Tech support, Third-party services, Vendor support, Mainframe, Availability, Capacity planning, Hardware, Integration with other platforms, Storage products and equipment, EMC, Hitachi Data Systems, IBM

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?

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