Expand Configuration and Management Manual (G06.24+)

Troubleshooting
Expand Configuration and Management Manual—523347-008
21-31
Reporting Network Problems
balanced after a few minutes, then it is likely that most of the traffic is between just
one or a few pairs of endpoints, making it impossible to spread the load over all the
paths in the multi-CPU path. If this is not the case and the problem is severe, then
stop and restart one path to force traffic to be redistributed.
Reporting Network Problems
If you need to bring a problem to the attention of your HP representative, HP
recommends that you have the following information available:
•
A description of the problem (either verbal or written).
•
Any related error messages.
•
Action taken to resolve the problem.
•
Results of traces taken up to the point of failure. (How and when to take a trace is
explained in Tracing.)
•
Memory dumps when the system freezes. (Online dumps are of minimal use.)
•
Other supporting information, such as:
°
System environmental information
°
Results of running utility status-type commands
°
Results of diagnostics
Tracing
Tracing is initiated using the Expand subsystem SCF TRACE command. Tracing
allows HP personnel to see the history of a data communications link, including
significant points in the internal processing of the traced entity. For tracing to be an
effective, fault-finding tool, make sure you follow these guidelines:
•
Always trace both ends of a path.
•
Ensure that all traces for a particular problem are taken at the same time.
•
If the data rate is high, or if the trace is expected to run for many hours, preallocate
the file space for the trace file using the File Utility Program (FUP). A 3- or 4-
megabyte file is generally sufficient for all but the longest or most work-intensive
traces.
•
Gather a $NCP trace even if you don’t think the problem involves $NCP. It is
preferable to have too much rather than too little information.
Note. A TRACE PATH command will also trace all lines in a multi-line path, unless a TRACE
LINE command has already been issued for one or more lines in the path.