Specifications

l Any: The alert fires if any attribute is returned.
l Range: The alert fires when the value of the attribute is outside of a
specified range.
If you select Range, the following additional options are displayed:
l Select Less Than and Greater Than to define the range of values for
which the alert should fire. The alert fires when the value is in the
range, not outside of the range.
l Select Evaluate this range once against the entire result to base
the alert on the total value across search results, as defined in the
Aggregation Function list.
l Select Evaluate this range against each VM to base the alert on the
attribute value of each search result.
Because virtual environments are dynamic, you may only want an alert to fire if a
condition for the alert has been met for a sustained period of time. For example,
you may not want an alert to be fired immediately the first time when a VM has
high CPU utilization, but only if the high CPU utilization is sustained over a
specific time span. In this case, specify the time span in the Sustained Minutes
field.
Because alerts are only evaluated when new data is collected by Virtualization
Manager, set the Sustained Minutes to a period that matches the collection
period for that data type. By default, performance data is collected every 10
minutes, and configuration data is collected every 12 hours. Check the Evaluate
on settings on the Scope tab to see whether the alert is evaluated on a
performance collection schedule, or a configuration collection schedule.
Note: Alerts often perform mathematical operations on the properties. For such
cases, you can use XPath in the Attribute field. In most cases, XPath is used to
create an average or summary of multi-value properties. For example, to get the
total free space of all disk volumes in a VM, type the following in the Attribute
171
Attributes