mc-subclusters-note-if-adding-second-primary.md
You can add a second primary subcluster in order to stop the original primary. Be sure to make the replacement primary subcluster at least one node larger than the original. (If you make them the same size, they both count equally toward the quorum, and stopping either would violate the quorum, so you cannot stop either one. For more information, see Data integrity and high availability in an Eon Mode database.)