Final answer:
In a failover cluster, the option to revert to a preferred owner when it's available is called Preferred Owner Node. When a preferred owner node becomes available, it automatically regains ownership of the resources in the cluster.
Step-by-step explanation:
In a failover cluster, the option to set if you want to revert to a preferred owner when it is available is called Preferred Owner Node.
When a preferred owner is available, it means that the specific node has the highest priority to take ownership of a particular resource in the cluster. This option ensures that the cluster tries to assign ownership to the preferred owner node whenever possible. If the preferred owner node becomes available, it will automatically regain ownership of the resources.
For example, let's say we have a failover cluster with three nodes: A, B, and C. Node A is set as the preferred owner for a specific resource. If Node A fails, the cluster will assign the ownership to Node B or Node C. However, once Node A becomes available again, the cluster will automatically revert the ownership back to Node A, as it is the preferred owner.