TS/MP System Management Manual (G06.24+, H06.03+)

Starting and Stopping a PATHMON Environment
NonStop TS/MP System Management Manual—541819-001
2-4
Starting the PATHMON Process
You should always provide a name for your PATHMON process. You use this name to
identify your the PATHMON process when you communicate with the PATHMON
process through PATHCOM. (If you do not supply a name, the system gives the
PATHMON process a default name, $X984. It is recommended that you provide your
own PATHMON name, which is often easier to remember.)
The name you choose for the PATHMON process must start with a dollar sign ($)
followed by one to five alphanumeric characters, or if the PATHMON name is used
across a network, one to four alphanumeric characters. The first alphanumeric
character must be a letter.
RUN Options
In addition to the PATHMON name, two other parameters, processor and NOWAIT,
are generally specified in the RUN command. These parameters are Guardian RUN
options that take effect when the PATHMON process begins execution.
The processor attribute indicates the processor in which the primary member of your
PATHMON process pair runs in a multiprocessor environment. You can select any
processor for this purpose. If you do not specify a processor, the system selects a
processor at random. Using the default value can result in an error if the PATHMON
process later attempts to start its backup process in the same processor. In Figure 2-2
on page 2-4, the primary PATHMON process runs in processor 3.
In a single-processor environment, the PATHMON process always runs as a single
process in the only processor available, whether or not you specify the processor
attribute.
The NOWAIT parameter requests the TACL command interpreter to execute the
PATHMON process under the NOWAIT RUN option. You specify this option so that
Figure 2-2. Starting the PATHMON Process
Caution. If multiple Pathway environments are configured on a node, do not assign the name
$PM to any PATHMON process on that node. Your commands might be applied to the wrong
PATHMON environment.
$PM is the default name used when someone opens communication with PATHCOM without
specifying a PATHMON name. Suppose that your PATHMON environment runs under the
PATHMON named $PMX, but you forget to specify this name. PATHCOM attempts to direct
subsequent commands to a PATHMON process named $PM; if a PATHMON process with this
name exists, your commands are applied to the wrong PATHMON environment.
Command
Interpreter
PATHMON
$ PMX
1> PATHMON / NAME $PMX, CPU 3, NOWAIT/
VST011.vsd