Using EMS HA Monitors

28 Chapter 1

Installing and Using EMS

Figure 1-8 Package Resource Dependencies Screen

When you select a resource, either from the “Add a Resource” screen, or from the

“Package Resource Dependencies” screen by selecting a resource and clicking

“Modify Resource Dependencies...” you get a screen similar to Figure 1-9.

To make a package dependent on an EMS resource, select a Resource Up Value

from the list of Available Resource Values, then click “Add.” The example in Figure

1-9 shows the possible values for pv_summary. Different resources show different

available “Up” values.

NOTE Make sure you always select UP as one of the UP values. MC/ServiceGuard creates

an EMS request that sends an event if the resource value is not equal to the UP

value.

If you select UP, the package fails over if the value is anything but UP. If you select

UP and PVG-UP, the package fails over if the pv_summary value is not equal to UP

or PVG_UP; in other words, if pv_summary were SUSPECT or DOWN.

The polling interval determines the maximum amount of elapsed time before the

monitor knows about a change in resource status. For critical resources, you may

want to set a short polling interval, for example 30 seconds, which could adversely

affect system performance. With longer polling intervals you gain system

performance, but risk not detecting problems soon enough.