Owners Manual

Top N [Assets] | Performance Monitoring
422 OMNM 6.5.2 User Guide
Top N [Assets]
The OpenManage Network Manager system uses seeded, default Active Performance Monitors
(APM) to display performance data in several categories. The Top
Asset portlets display device
monitoring summary results. For example, the Top Ping Response (Slowest) portlet displays the
devices that are the slowest to respond to a ping.
Devices listed are ranked by the monitored parameter. Hover over the Ping Rate column to view
recent activity in a pop-up graph.
If you right-click a monitored item, you can select from menu items like those that appear in the
portlet described in
Managed Resources on page 179.
For some portlets (for example Top CPU/Disk/Memory Utilization, Top Interface Bandwidth/
Errors), the right-click Performance menu items include Key Metrics. The menu can include
Performance, which displays Dashboard Views related to the selected monitor.
For some packages, these can also include IP SLA statistics like the following: Top Bandwidth
Received/Transmitted, Top CPU/Disk Utilization, Top Ingress/Egress Packet Loss, Top Jitter, and
Top RT Delay. To see all available
To p portlets, click Add > Applications and look below Top N on
the subsequent panel.
Top RT Delay maps to the AvgRTDelay inventory metric. When no metric for Average RT Delay
exists in the MIB, OpenManage Network Manager calculates it the average RT Delay using two
MIB attributes: RTTSum (the total time taken for all round trips) and NumOfRTT (the number of
round trips taken). The calculation of AvgRTT is the value of RTTSum divided by the value of
NumOfRTT. OpenManage Network Manager maps this attribute to the AvgRTDelay inventory
metric.
NOTE:
An alternative way to provide this kind of performance information is to use the Traffic Flow Analyzer. For
systems generating large amounts of information that strain the limits of processing capacity, see Best
Practices: Performance Tuning Traffic Flow Analysis on page 551 as a possible solution.
Calculations within Top N Portlets
The following Top N portlets are potentially available. Only those with monitored parameters
display data. The data comes from monitor data using the monitor inventory mappings specified in
each monitor.