How Does Hardware Monitoring Work; Figure 1-1 Components Involved In Hardware Monitoring - HP B6191-90029 User Manual

How Does Hardware Monitoring Work?

The following figure shows the basic components involved in hardware monitoring.
Figure 1-1 Components Involved in Hardware Monitoring
The typical hardware monitoring process works as follows:
1. While monitoring its hardware resources, the hardware event monitor detects some type of abnormal
behavior on one of the resources.
2. The hardware event monitor creates the appropriate event message, which includes suggested corrective
action, and passes it to the Event Monitoring Service (EMS).
3. EMS sends the event message to the system administrator using the notification method specified in the
monitoring request.
4. The system administrator (or Hewlett-Packard service provider) receives the messages, corrects the
problem, and returns the hardware to its normal operating condition.
5. If the PSM has been properly configured, events are also processed by the PSM. The PSM changes the
device status to DOWN if the event is serious enough. The change in device status is passed to EMS,
which in turn alerts MC/ServiceGuard. The DOWN status will cause MC/ServiceGuard to failover any
package associated with the failed hardware resource.
NOTE The Difference Between Hardware Event Monitoring and Hardware Status
Monitoring
Hardware event monitoring is the detection of events experienced by a hardware resource. It is
the task of the EMS Hardware Monitors to detect hardware events. Events are temporary in
the sense that the monitor detects them but does not remember them. Of course the event itself
may not be temporary—a failed disk will likely remain failed until it is replaced.
Hardware status monitoring is an extension of event monitoring that converts an event to a
change in device status. This conversion, performed by the PSM, provides a mechanism for
remembering the occurrence of an event by storing the resultant status. This persistence
provides compatibility with applications such as MC/ServiceGuard, which require a change in
device status to manage high availability packages.
Chapter 1
Introduction
Hardware Monitoring Overview
17