Best rules of thumb?
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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?
Software/Hardware used:
Software/Hardware used:
ASKED:
November 1, 2004 5:39 PM
UPDATED:
August 6, 2009 7:39 PM
Answer Wiki:
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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