Resource group dependencies

PowerHA® SystemMirror® supports resource group ordering and customized serial processing of resources to accommodate cluster configurations where a dependency exists between applications residing in different resource groups.

With customized serial processing, you can specify that a given resource group be processed before another resource group. PowerHA SystemMirror offers an easy way to configure parent and child dependencies between resource groups (and applications that belong to them) to ensure proper processing during cluster events.

Location dependency policies are available for you to configure resource groups so they are distributed the way you expect not only when you start the cluster, but also during fallover and fallback. You can configure dependencies so that specified groups come online on different nodes or on the same nodes. PowerHA SystemMirror processes the dependent resource groups in the proper order using parallel processing where possible and serial as necessary. You do not have to customize the processing. You can configure different types of dependencies among resource groups:

• Parent and child dependencies
• Location dependencies.

The dependencies between resource groups that you configure are:

• Explicitly specified using the SMIT interface
• Established cluster-wide, not just on the local node
• Guaranteed to be honored in the cluster.