You must run the metrocluster configure command to start data protection in a MetroCluster configuration.
Additional data aggregates can be either mirrored or unmirrored.
You can verify this with the storage aggregate show command.
You issue the metrocluster configure command once, on any of the nodes, to enable the MetroCluster configuration. You do not need to issue the command on each of the sites or nodes, and it does not matter which node or site you choose to issue the command on.
The metrocluster configure command automatically pairs the two nodes with the lowest system IDs in each of the two clusters as disaster recovery (DR) partners. In a four-node MetroCluster configuration, there are two DR partner pairs. The second DR pair is created from the two nodes with higher system IDs.