HP NonStop NS manual Task 2 Find and Eliminate the Cause of the Problem

Introduction to Integrity NonStop NS-Series	Task 2: Find and Eliminate the Cause of the Problem
Operations

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:

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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.

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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:

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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	TACL	Security
	hardware	process
What?
Terminal $JT1.#C02 is hung	Yes	Yes	Yes
Where?
Office of USER.BONNIE	Yes	Yes	Yes
When?
8:30 a.m. today	Yes	Yes	Yes
Two days ago at 8:30 a.m.	Yes	Yes	Yes
After 3 failed logon attempts	No	No	Yes
Magnitude?
Intermittent	?	Yes	Yes
Goes away on its own	?	Yes	Yes

HP Integrity NonStop NS-Series Operations Guide—529869-005

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