VMware 4817V62 Administration Guide - Page 235

Chapter 21 Working with Alarms n Is above and Is below To define a condition or state trigger, you choose the appropriate operator set and enter the values for the warning and alert status. You can use any number of triggers for an alarm. When you use more than one trigger, you choose whether to trigger the alarm when any conditions are satisfied or when all conditions are satisfied. For example, you can create a host alarm that has two condition triggers, one for CPU usage and one for memory usage: Table 21-1. Example - Setting Condition Triggers Warning Alert Trigger Condition Operator Value Operator Value 1 CPU usage Is above 75% Is above 90% 2 Memory usage Is above 75% Is above 90% If you trigger the alarm when all conditions are satisfied, the alarm will trigger the warning only when both CPU usage and memory usage values are above 75%. Likewise, it will trigger the alert only when both CPU usage and memory usage are above 90%. NOTE Unexpected results might occur when you have an alarm with multiple triggers with opposing warning and alert conditions, and you set the alarm to trigger when all conditions are satisfied. For example, an alarm has two triggers that set warnings and alerts for the virtual machine power state. Table 21-2. Example - Opposing Warning and Alert Conditions Trigger Warning Alert 1 Powered Off Powered On 2 Powered On Powered Off If you choose to trigger the alarm when all conditions are satisfied, the alarm triggers a warning. This is because the vServer System uses the AndAlarmExpression operator to validate the condition statuses for each trigger. When they are all satisfied, the first condition is satisfied, and therefore is used: Warning & Alert = warning. Condition and State Trigger Components Condition and State triggers are comprised of a trigger type, a triggering condition and length, and warning and alert values. Table 21-3 describes each component of Condition and State triggers. Table 21-3. Condition and State Trigger Components Trigger Component Description Trigger type Condition Warning Condition Length The condition or state to monitor, for example, VM CPU Usage (%). The qualifier used to set the threshold for the trigger, for example, Is Above and Is Below. The value that must be reached for the alarm to transition from a normal state to a warning state, and to trigger the alarm. For condition triggers, after the warning condition is reached, the amount of time the warning condition stays true in order for the warning to trigger. State triggers do not have condition lengths. As soon as the state condition occurs, the warning is triggered. VMware, Inc. 235