It is possible that one of the nodes does not come up when all the nodes in the cluster are restarted, due to the "minimum seed requirement" safety that is enforced by GAB. Human intervention is needed to safely determine that the other node is in fact not participating in its own mini-cluster.

The following should be carefully validated before manual seeding, to prevent introducing split-brain and subsequent data corruption:

Run the following command to manually seed GAB membership:

# gabconfig -cx

Refer to gabconfig (1M) for more details.