The CLUSCTL_CLUSTER_GET_FQDN cluster control code retrieves the FQDN of the cluster.

After successful completion of the method, the server MUST write the FQDN, as a null-terminated Unicode string, to the buffer that is designated by lpOutBuffer. If the lpOutBuffer buffer is not large enough to accommodate the FQDN string and the terminating Unicode null character, error 0x000000EA (ERROR_MORE_DATA) MUST be returned.

The server SHOULD<151> accept a CLUSCTL_CLUSTER_GET_FQDN resource control code request if its protocol server state is read-only, and the server MUST accept the request for processing if it is in the read/write state, as specified in section 3.1.1.