HP HA s Software manual Chapter

Installing and Using EMS

What are EMS HA Monitors?

Monitors are applications written to gather and report information about specific resources on the system. They use system information stored in places like /etc/lvmtab and the MIB database. When you make a request to a monitor, it polls the system information and sends a message to the framework, which then interprets the data to determine if an event has occurred and sends messages in the appropriate format.

EMS HA Monitors work best in a high availability environment; it aids in quickly detecting and eliminating single points of failure, and monitors resources that can be used as MC/ServiceGuard package dependencies. However, EMS HA Monitors can also be used outside a high availability environment for monitoring the status of system resources.

A set of monitors is shipped with EMS: disk, cluster, network interface, and system resource monitors. Other Hewlett-Packard products are bundled with monitors that fit into the EMS framework, such as ATM and HP OSI Transport Service 9000. You can also write your own monitor; see Writing Monitors for the Event Monitoring Service (EMS).

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