In this example scenario, you change alarm settings and specify which actions occur when the datastore usage alarm is triggered. You acknowledge the alarm to let other users know that you are aware of datastore usage that exceeds a certain threshold.

The Datastore usage on disk alarm is one of the many default alarms included with vCenter Server. The alarm is enabled at installation. If the used disk space on the datastore exceeds 75 percent, the alarm triggers a Warning. If the used disk space on the datastore then exceeds 85 percent, the alarm triggers an Alert. These warnings and alerts appear in the user interface in the form of modified icons for the elements affected. To have the alarm perform actions beyond this visual notification, change the configuration of the alarm. Follow the workflow in the sample tasks in this example scenario to become familiar with changing the settings of an alarm and responding to a triggered alarm.

Changes that you can make to the datastore usage alarm include altering the percentage values for a Warning and for an Alert, modifying the frequency of an alarm, and defining the action the system takes at an alarm. For this example, you lower the percentage values, but keep the default frequency. In addition, on the Actions page, you configure the action so that the system sends an email to specified addresses when a condition triggers the alarm.

1

To begin the example scenario, you must navigate to the Alarm Definitions page. You can view alarm settings from any object, but you can modify settings only through the vCenter Server object on which the alarm is defined.

2

In the previous task, you navigated to the Alarms definitions page and started the Datastore usage on disk - Edit wizard. You can specify the events, states, or conditions that trigger the alarm in the Datastore usage on disk - Edit wizard. Select triggers that you can activate in the example environment and choose an action that lets you verify alarm functionality.

3

By default, vCenter Server is not configured to send email notifications. Set the system SMTP server and sender account to receive an email when the datastore usage alarm is triggered.

4

When storage space utilization on one of your datastores surpasses 30%, the Datastore usage on disk - example alarm is triggered. When you acknowledge an alarm, other users see the alarm as acknowledged and know that you are aware of disk space usage rates.

5

You have set up, triggered, and acknowledged the datastore usage alarm. Now, address the critical trigger condition and reset the triggered Datastore usage on disk - example alarm to reenable its actions.