Master node decommissioning in Ozone This feature helps you to decommission Ozone Manager (OM) and Storage Container Manager (SCM). SCM decommissioningStorage Container Manager (SCM) decommissioning is the process in which you can gracefully remove one of the SCM from the SCM HA Ring.OM decommissioningOzone Manager (OM) decommissioning is the process in which you gracefully remove one of the OM from the OM HA Ring.