KB Issue
Adding a Server Node to a Failover Cluster will sometimes give you an error that it is already joined to an existing cluster.
This happens only when you have removed the server node from another cluster.
Issue Details
When removing a Server Node from a Cluster, it will leave its information behind. This data needs to be cleared from the system for the Server to be added to another Cluster.
Recreate Issue
When you remove a server node from a Failover Cluster and then try and join it to another Failover Cluster, you will receive the error that it is joined to another cluster.
Resolve Issue
Log on to the Server which you are trying to join to the Failover Cluster.
  1. Start PowerShell under Administrator
  2. Run Import-Module FailoverClusters
  3. Run clear-clusternode
  4. Clear-ClusterNode
  5. Are you sure you want to forcefully clean up cluster node ServerName?
    [Y] Yes [N] No [S] Suspend [?] Help (default is "Y"):
  6. Choose [Yes] and press [Enter]
    7. On the Server running the Failover Cluster Manager
  7. Failover Cluster Manager
  8. Enter the server name and press [Add]