HP NonStop NS-series

Introduction to Integrity NonStop NS-Series
Operations
HP Integrity NonStop NS-Series Operations Guide—529869-005
1-7
Task 2: Find and Eliminate the Cause of the Problem
Task 2: Find and Eliminate the Cause of the Problem
After you collect the facts, you are ready to begin considering the possible causes of a
problem. Using these facts and relying on your knowledge and experience, begin to
list possible causes of the problem.
Task 2a: Identify the Most Likely Cause
To evaluate the possible causes of any problem, you must compare each cause with
the problem symptoms. The problem-solving worksheet gives you a guide for
accomplishing this task. In the following example:
•
Possible causes become column headings
•
Entries made in the worksheet’s rows indicate whether the cause in that column
could have produced the problem symptoms you listed in that row.
°
Write yes in the appropriate box if that cause could explain that symptom.
°
Write no in the appropriate box if a possible cause does not explain a fact.
The most likely cause is the one that best explains all the facts; that is, the cause
that contains the most yes answers.
For example, possible causes of a hung terminal problem could be:
•
A terminal hardware problem
•
A stopped or suspended TACL process
•
System security, which locks a user out after three unsuccessful logon attempts
This worksheet lists some possible causes of a hung terminal and illustrates further
how to evaluate the possible causes:
Problem Facts Possible Causes
Terminal
hardware
TACL
process
Security
What?
Terminal $JT1.#C02 is hung Yes Yes Yes
Where?
Office of USER.BONNIE Yes Yes Yes
When?
8:30 a.m. today
Two days ago at 8:30 a.m.
After 3 failed logon attempts
Yes
Yes
No
Yes
Yes
No
Yes
Yes
Yes
Magnitude?
Intermittent
Goes away on its own
?
?
Yes
Yes
Yes
Yes