Working With Alarms - VMware 4817V62 - vSphere - PC Administration Manual

Working with Alarms

Alarms are notifications that occur in response to selected events, conditions, and states that occur with objects
in the inventory. You use the vSphere Client to create and modify alarms.
The vCenter Server system is configured with a set of predefined alarms that monitor clusters, hosts,
datacenters, datastores, networks, and virtual machines. it is also configured with alarms that monitor vCenter
Server licensing.
Each predefined alarm monitors a specific object and applies to all objects of that type. For example, by default,
the Host CPU Usage alarm is set automatically on each host in the inventory and triggers automatically when
any host's CPU usage reaches the defined CPU value.
If the predefined vCenter Server alarms do not account for the condition, state, or event you need to monitor,
you can define custom alarms.
When you set an alarm on a parent object, such as a vCenter Server, a datatcenter, or a cluster, all applicable
child objects inherit the alarm. You can also set an alarm on a folder to propagate the same alarm to all objects
contained in that folder. You cannot change or override an alarm that is set on a child object from its parent
object. You must change the alarm on the child object itself.
Alarms are composed of a trigger and an action.
Trigger
VMware, Inc.
A set of conditions that must be met for an alarm warning and alert to occur.
Most triggers consist of a condition value and a length of time that value is true.
For example, the virtual machine memory alarm triggers a warning when
memory usage is over 75% for one hour and over 90% for five minutes.
VMware uses colors to denote alarm severity:
Normal – green
n
Warning – yellow
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Alert – red
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