How is a critical subcluster determined?

Deb_Chatigny

How is a critical subcluster determined? Is it automatically determined by Vertica?
@dsprogis @ybei

Eon Mode: Past, Present, Future

ybei

A subcluster is "critical" means: if you shutdown this subcluster, your entire cluster will shutdown, due to either lose quorum, or lose the shard coverage. This is similar to the notion of "critical node".

And you can imagine, secondary subcluster will never be critical subcluster.