In today’s entry I would like to introduce quorum and epsilon concepts. Both are related with cluster health, needed in case of potential communications and connectivity issues.

What is Quorum?

When a cluster is in quorum, it means that majority of nodes are healthy and can communicate with each other. In other words, quorum is a precondition for a functioning cluster. When quorum is lost, the cluster does not have the ability to accomplish normal operations. Continue reading →