LifeKeeper allows you to create relationships between resource instances. The primary relationship is a dependency, for example one resource instance depends on another resource instance for its operation . The combination of resource instances and dependencies is the resource hierarchy.
For example, since /usr1 depends on its operation upon the disk subsystem, you can create an ordered hierarchy relationship between /usr1 and those instances representing the disk subsystem.
The dependency relationships specified by the resource hierarchy tell LifeKeeper the appropriate order for bringing resource instances in service and out-of-service. In the example resource hierarchy, LifeKeeper cannot bring the /usr1 resource into service until it successfully brings into service first the disk and device instances.
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