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Foglight 7.3.0 - Performance Tuning Field Guide

Overview Hardware and Operating System Tuning Management Server Tuning Java Virtual Machine Tuning Backend Database Tuning High Availability (HA) Tuning Agent Tuning Store and Forward Processing Appendix: Performance Health Check Appendix: Analyzing a Support Bundle

Model Checks

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Check the topology change count on the Alarms page. If there are changes in every time interval, then there is a strong possibility that the model is unstable.
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Check the topology object count as a function of time. If no agents have been added or significantly changed recently, then the model should not be growing.

Possible Actions

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Tune agent collection to avoid changes.

Are Too Many Alarms Firing?

It is possible for Foglight® to be configured in such a way that too many alarms are firing. There are two main manifestations of alarm instability:

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Massive alarm fire-and-clear (that is, an excessive number of alarms are firing and clearing).
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A large number of total alarms.

A large number of alarms can create problems when viewing alarms pages and can have an adverse affect on the functioning of federation. When a large number of alarms are generated, that consumes resources on the Management Server, which can slow down other operations.

The Number of Alarms is in a Healthy State if...

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The total alarm count on the Alarms page meets the expectations for your monitoring goals. Any total greater than 1000 should be a concern. Alarms are clipped at 10,000, so any number approaching 10,000 indicates a problem.
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The total number of alarms, including cleared alarms, is reasonable. It is possible to have a low number of alarms while having a huge number of cleared alarms. This is an indication of massive alarm fire-and-clear.
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