https://www.ibm.com/docs/en/ibm-mq/9.0.x?topic=group-deleting-pacemaker-cluster-ha
Deleting the Pacemaker cluster (HA group)
The HA group is a Pacemaker cluster. You can delete a Pacemaker cluster configuration by running the rdqmadm command with the -u option.
the pacemakerdeletingclusterhagroup