Validate network connectivity (Option A): Before adding a node, you must ensure it has valid IP addresses on the management and data networks and can reach the existing MDM cluster. Without this, the "Add Node" wizard will fail.
Assign the node to an existing Protection Domain (Option B): During the add process, you must explicitly tell the system where this new node belongs. You assign it to a Protection Domain (and optionally a Fault Set). This tells the system which other nodes it should peer with for data mirroring.
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