This is the sample response for mmcluster commands. In the above output, Node 1,2 and 3 are the ESS nodes and Node 62,63 and 64 are the HDP cluster nodes which were enrolled into the ESS cluster. We will go ahead and delete the HDP nodes.
2) Delete the node by running the below command
mmdelnode -N hdp-gpds-node-6.openstacklocal
Run this command for every HDP node. After deleting all nodes you can confirm if the nodes are really deleted by running "mmlscluster" again.