Getting a Quick Start with NerveCenter - Monitoring Alarms - Analyzing Historical Detail for an Alarm Instance -
Viewing Alarm Instances      Reading Logged Data

Analyzing Historical Detail for an Alarm Instance

To obtain more information about an alarm instance, you can examine its alarm history. The Alarm History window displays read-only information that allows you to track an alarm's sequence of events.

 
  To open the Alarm History window:

  From the Alarm Summary window, double-click an alarm instance.

The Alarm History window is displayed.

The Alarm History window contains the state diagram for an alarm instance. If you selected an IfData_LogToFile instance, the window on your screen resembles Alarm History Window for an IfData_LogToFile Alarm Instance.

Alarm History Window for an IfData_LogToFile Alarm Instance

If you selected an ifLoad instance, however, your window would instead contain states and transitions for the ifLoad alarm.

The state diagram shows the alarm transitions and states. A list at the bottom displays the transitions leading to the current state for the instance. From this list, you can determine the most recent transition and follow along as the transitions lead to the current state of the alarm.

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   If you are looking at an ifLoad instance, you probably have only one transition in your list. The reason is that your targeted node experienced only one instance involving a significant load. When you start monitoring your full network using a variety of behavior models, you will typically see a number of lines in the history list.

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  To follow the path of transitions:

  Select each line of the history list, first to last.

The corresponding transition turns red.

If Refresh becomes enabled, you can select it to update the history with any transitions that have occurred since you first opened the window.

When you select a transition from the transition list, the Node and Poll buttons become enabled. Selecting an enabled button opens a definition window for the related object, such as the poll that caused the highlighted transition. This feature is useful for analyzing and troubleshooting network events. If your alarm instance belonged to a behavior model that monitors unresponsive nodes, you could select Node and, from the node's definition window, ping the node to establish whether it was up.

When you have finished looking at the history for this alarm instance, select Cancel to close the window. Repeat the process for one or two other alarm instances in your Alarm Summary window.