Chapter 1 Voice Health Monitor Overview
Overview of VHM
VHM correlates the collected information and generates events on voice components that can be viewed in the Monitoring Console or on the
VHM and DFM share many features as well as some components of their architectures. VHM and its commonality with DFM are described in more detail in the “VHM and DFM Interdependencies” section on page
Event Correlation in VHM
Two types of events are generated by VHM: Compounds and Symptoms. One or more Symptoms generate Compound or aggregated events. Symptoms are faults, such as Power Supply Down or Temperature Too High, which generate Environment Exceptions. Events are generated when fault conditions are detected and the event correlation cycle is reached. The event correlation cycle in VHM occurs every 30 seconds.
An example of an event correlation in VHM is TooManyInActivePhones. This event is generated when phones registered with call managers in a cluster become inactive and cross the InActivePhoneThreshold over a number of active phones. In this event, all the call managers in the cluster are monitored to find out the total number of phones that became inactive and compare that number with the total number of active phones in the cluster.
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