Primary subcluster

In Eon Mode, a primary subcluster is a type of subcluster that is intended to form the core of your database. Vertica only considers the nodes in primary subclusters when determining the K-safety of your database. Your database can remain running as long as half the nodes in your primary subclusters are up, and all shards have at least one node in a primary subcluster as a subscriber. See Subcluster Types and Elastic Scaling for more information.