TS/MP System Management Manual (H06.05+, J06.03+)

Maintaining a PATHMON Environment
HP NonStop TS/MP System Management Manual—541819-007
5-27
Managing PATHMON Process Performance
The PATHMON process and Server Links
If a server process goes down, the operating system automatically informs the
PATHMON process that owns that server class. The PATHMON process then
dissolves all links to that server process by sending a message to all LINKMON
processes or ACS subsystem processes with established links to that server process.
Because servers are (usually) coded to stop themselves when all openers have closed
them, system managers seldom need to worry about stopping servers.
Managing PATHMON Process Performance
The performance of the PATHMON process is critical to response time for applications
and management tasks.
Generally, in the production environment, the PATHMON process should be busy only
during startup and shutdown of the PATHMON environment. If the PATHMON process
is very busy at times other than startup and shutdown, you should take steps to
alleviate its workload.
These sections describe factors that can cause poor performance and steps you can
take to improve performance.
Detecting Problems
These factors might cause the PATHMON process to be busy at times other than
startup and shutdown:
•
Poor configuration
•
Creating and deleting links
•
Gathering statistics and information
•
Logging errors
The PATHMON process sends an external
shutdown notification
Deletes all links owned by that
PATHMON process, allowing current I/O
to complete. Consequently, no links are
returned to the PATHMON process.
The PATHMON process returns an unexpected
I/O error or close message, or the link manager
detects a message protocol error.
Deletes all links owned by that
PATHMON process, allowing current I/O
to complete. Consequently, no links are
returned to the PATHMON process.
A link manager gets an error trying to
communicate with the PATHMON process
Deletes all links owned by that
PATHMON process, allowing current I/O
to complete. Consequently, no links are
returned to the PATHMON process.
Cause Action