After an alarm is acknowledged, its alarm actions are discontinued. Alarms are neither cleared, nor reset when acknowledged.

Acknowledging an alarm lets other users know that you are taking ownership of the issue. For example, a host has an alarm set on it that monitors CPU usage and that sends an email to an administrator when the alarm is triggered. The host CPU usage spikes, triggering the alarm which sends an email to the host's administrator. The administrator acknowledges the triggered alarm to let other administrators know he is working on the problem, and to prevent the alarm from sending more email messages. The alarm, however, is still visible in the system.


Launch the vSphere Client and log in to a vCenter Server system.

Required privilege: Alarm.Alarm Acknowledge


  1. Navigate to the inventory panel.
  2. If the status panel is not available, select View > Status Bar to view the status pane.
  3. In the status bar, click Alarms to display the Triggered Alarms panel.
  4. Right-click the alarm and select Acknowledge Alarm.
    To acknowledge multiple alarms at one time, Shift+click each alarm to select it, right-click the selection, and select Acknowledge Alarm.