Synchronizing configuration changes
When you change the cluster configuration, you update the data stored in the PowerHA® SystemMirror® Configuration Database in the DCD. For example, when you add an additional network interface to a cluster node, you must add the interface to the cluster definition so that the cluster nodes can recognize and use it.
When you change the cluster definition on one cluster node, you must also update the PowerHA SystemMirror Configuration Databases on the other cluster nodes, a process called synchronization. Synchronization causes the information stored in the DCD on the local cluster node to be copied to the PowerHA SystemMirror Configuration Database object classes in the DCD on the other cluster nodes.
When synchronizing the cluster triggers a dynamic reconfiguration event, PowerHA SystemMirror verifies that both cluster topology and cluster resources are correctly configured, even though you may have only changed an element of one of these. Since a change in topology may invalidate the resource configuration, and vice versa, the software checks both.