3.1.1.1.2.1 Simple Dependencies
A simple dependency is a relationship between two resources, a dependent and a provider, with the following rules:
The dependent resource cannot be brought online until the provider resource is online.
The provider resource cannot be brought offline until the dependent resource is offline.
The dependent resource will not remain online if the provider resource is not online (for example, if the provider resource has failed).
Simple resource dependencies are maintained as nonvolatile configuration data in the cluster state.