Recently attempting to install a new three node cluster I ran into a new issue. Once I was able to run a successful “Cluster Validation Check” and chose the option to install a new cluster I received a message “The computer xxx is joined to a cluster”.
My first thought then was to remove clustering and try a fresh install of the feature. That didn’t go to well either, I was informed that the node was an active node of a cluster that it in fact was NOT.
I did a bit of research and found that I could clear this with using PowerShell. To do so I had to open PowerShell as an administrator and load the failoverclusters module. Then I could run the command clear-clusternode to forcefully clean up the cluster node.
Once the node was cleaned up I was able to proceed with the cluster build.