Network Partition in a Three Node Cluster

A partition results when network connectivity is lost between multiple SDM nodes in a cluster.

Typically, a multiple-node cluster consists of three nodes. When network connectivity is lost in this scenario, the partition that has two nodes and can communicate, elects a master. The partition that contains the single, orphaned node transitions to a READ-ONLY mode.

When network connectivity is re-established for the multiple-node cluster, one node is elected master and the cluster resumes normal operation. Database updates are not permitted until the partition between all nodes of the cluster is resolved or the cluster is reconfigured.