OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

Tuning and Observing netmon Queues

During first discovery you may notice that netmon’s CPU utilization is remarkably lower than expected, the rate of discovery is correspondingly depressingly low, or device status changes are displayed late by NNM. Yet, the overall system utilization is quite low. You want to know why netmon isn’t discovering devices faster and what you can do to improve the situation.

Enter the netmon optional -q ICMP-queue-length and -Q SNMP-queue-length parameters in the netmon.lrf file. Both default to 20 on UNIX systems and 3 on Windows NT systems. These values may be increased according to the following guidelines:

The ICMP-queue-length parameter should be increased only if netmon is getting behind (as indicated by the ...