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

Maintaining a PATHMON Environment
NonStop TS/MP System Management Manual—541819-001
5-28
Improving Performance
Logging Errors
The PATHMON process is responsible for all error logging. Delays in logging errors or
status messages can adversely affect the performance of the PATHMON environment.
You should examine the log file and understand what causes each of the errors. In a
well-designed, well-configured PATHMON environment, the log should be empty or
nearly so. Occasional errors do not exact a large penalty. However, a poor
configuration—for example, one that causes may processes to frequently start and
stop—can cause a performance degradation just in the logging of the process status.
Failures
For large systems in which the PATHMON process manages numerous links, this
events can cause performance problems:
•
processor failure
•
Network failures
•
A TCP going down (Pathway/iTS environment only)
•
Server process failure
In certain network situations, communication delays between the PATHMON process
and link managers, such as the LINKMON process, can reduce response time even
further.
Improving Performance
You can improve PATHMON performance in some instances by reconfiguring your
PATHMON environment. These subsections describe options that you might want to
consider.
Configure for Sufficient Number of Links
You should ensure that there are enough links available in the system initially by
specifying appropriate values for MAXLINKS, LINKDEPTH, MAXSERVERS, and
MAXSERVERPROCESSES.
Use Multiple PATHMON Processes to Manage Servers and
Associated Links
You can create separate PATHMON processes to manage servers and their
associated links. By distributing link management among multiple processes, you
improve response time. The cost, however, is increased operational complexity.