HP HA s Software manual How Do I Tell EMS When to Send Events?

Installing and Using EMS

Using EMS HA Monitors

How Do I Tell EMS When to Send Events?

While the monitor may be polling disks every 5 minutes, for example, you may only want to be alerted when something happens that requires your attention. When you create a request, you specify the conditions under which you receive an alert. Here are the terms under which you can be notified:

When value is...	You define the conditions under which you wish to be
	notified for a particular resource using an operator (e.g. =,
	not equal, >, >=, <, <=) and a value returned by the
	monitor (e.g. UP, DOWN, INACTIVE). Text values are
	mapped to numerical values. Specific values are in the
	chapters describing the individual monitors.
When value changes	This notification might be used for a resource that does
	not change frequently, but you need to know each time it
	does. For example, you would want notification each time
	the number of mirrored copies of data changes from 2 to 1
	and back to 2.
At each interval	This sends notification at each polling interval. It would
	most commonly be used for reminders or gathering data
	for system analysis. Use this for only a small number of
	resources at a time, and with long polling intervals of
	several minutes or hours; there is a risk of affecting
	system performance.

If you select conditional notification, you may select one or more of these options:

Initial	Use this option as a baseline when monitoring resources such as
	available filesystem space or system load. It can also be used to
	test that events are being sent for a new request.
Repeat	Use this option for urgent alerts. The Repeat option sends an
	alert at each polling interval as long as the notify condition is
	met. Use this option with caution; there is a risk of high CPU
	use or filling log files and alert windows.
Return	Use this option to track when emergency situations return to
	normal.

22 Chapter 1