Two Ring (Cascade) Configuration

Table 4-1 shows a four-node cluster with four logical hosts defined. The table shows which physical nodes can master each of the four logical hosts.

To upgrade this configuration, you can remove nodes 1 and 3 from the cluster and upgrade them without losing access to any logical hosts. After you upgrade nodes 1 and 3 there will be a brief service outage while you shut down nodes 2 and 4 and bring up nodes 1 and 3. Nodes 1 and 3 can then provide access to all logical hosts while nodes 2 and 4 are upgraded.