APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

Chapter 6 131
Troubleshooting the APPC Subsystem
Troubleshooting Tools
A new trace file is created every time APPC subsystem internal tracing
is turned on, at subsystem startup or during run time. To start a new
trace file during run time, turn tracing off with the APPCCONTROL
TRACEOFF command, and then turn it back on again with the
APPCCONTROL TRACEON command.
NOTE When storing trace files to tape for analysis, be sure to include all the
files on disk at the time the problem occurred. An incomplete set of
trace files can hinder problem diagnosis.
When you turn on APPC subsystem internal tracing, you can specify a
size for the trace file, in 128-word records. The trace file size can range
from 0 through 32767 records. When you are trying to diagnose a
problem, you should specify a trace file size of 32000 records or larger.
Once a trace file has reached its specified size, trace records are
overwritten starting from the beginning of the file.
APPC Logging
Node Management Services (NMS) provides the logging services for the
APPC subsystem. APPC subsystem logging records the major events of
the APPC subsystem.
Logging is turned on through NMMGR configuration. The APPC
subsystem number is SUB0016. Logging events are divided into five
classes:
CLAS0010 records internal errors.
CLAS0011 records APPC subsystem warnings.
CLAS0012 records APPC subsystem information messages.
CLAS0013 records conversation information messages.
CLAS0014 records session performance statistics.
You can configure the logging messages to go to the system console, to
the log file, and to three separate
user.account s. Critical messages
should be logged to both the system console and the log file. That way,
messages erased from the terminal buffer can still be found in the log
file. Hewlett-Packard recommends that all classes of logging messages
be recorded in the log file and that all classes except CLAS0014
(performance statistics) be logged to the system console.
The logging messages and their meanings are documented under
“Logging Messages,” in Appendix A , “Messages,” of this manual. For
more information on logging and logging configuration, see the SNA
Link/XL Node Manager’s Guide.