A cluster resource is any physical or logical component that can be physically shared between multiple cluster nodes, but can only be hosted (owned) by one active node at a time. The virtual IP address, virtual computer name, shared disk, and even the applications are considered cluster resources. A cluster system allows you to categorize these resources as a "group" for a specific functionality purposes. These resource groups can be treated as a "container" of resources. A cluster resource group is a logical unit for application deployment, which means that a cluster-aware application must be installed into a group and bind itself with the resources that are associated with that group. The resource group is the minimum unit for failover purposes.
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