NS3000/iX Operations and Maintenance Reference Manual (36922-90039)

54 Chapter3
Getting Information About the Network
Logging and Tracing
Logging and Tracing
Both logging and tracing services are available to you for use as
diagnostic and debugging aids.
Logging records subsystem events as selected by the way you have
configured logging through NMMGR. Use logging in problem
determination and in monitoring network usage and resources.
Tracing is provided at both the user level and at an internal level.
User-level tracing provides a record of data communications subsystem
intrinsic calls. Internal level tracing records internal state transitions
and the sequences of module execution within data communications
subsystems. You should only use internal tracing under the
recommendation of an HP service representative.
The Logging Facility
Node management services, NMS, provides logging services for
Network Services, NetIPC, network transport, and all data
communications links. Logging is performed at three levels: network
logging, event logging, and link level logging. Network logging records
the usage of the communications network resources. It serves as a tool
in resolving network problems. Event logging records the major
subsystem events. The NSCONTROL command with the LOG= option can
be used to enable or disable detailed event logging for the Network
Services (see Chapter 7, “Commands,” for more information). The link
level logs to MPE/iX log files only.
You can configure logging to record messages to the console, to a log file,
or to both for each individual subsystem. See the HP 3000/iX Network
Planning and Configuration Guide or the NS 3000/iX NMMGR
Screens Reference Manual for information on how to configure logging.
Three commands are available to help you manage log files. SHOWNMLOG
displays the name of the current log file and shows the space that is
still available in the file. SWITCHNMLOG allows you to close the current
log file before it is full and open a new one. RESUMENMLOG allows you to
reactivate logging after a recoverable error. See Chapter 7,
“Commands,” for information on these commands.
The Tracing Facility
Tracing is provided for the Network Services subsystem, Network
Interprocess Communication (NetIPC), the network transport
subsystem, and the link subsystems. You enable tracing for the
Network Services by the DSLINE command for each user’s services.