Using Host-Based Data Replication

This section describes host-based data replication in a two-room campus cluster. A two-room configuration with host-based data replication is defined as follows:

• Two separate rooms.

• Both rooms with one node each and disk subsystems.

• Data replicated across disk subsystems in these rooms.

• At least one disk subsystem. This is connected to both hosts, used as a quorum device, and located in one of the rooms.

The examples in this section illustrate general campus cluster configurations and are not intended to indicate required or recommended configurations. For simplicity, the diagrams and explanations concentrate only on features unique to understanding campus clustering. For example, public-network Ethernet connections are not shown.

In this configuration, the system cannot recover automatically if the quorum disk is lost. Recovery requires intervention from your Sun service provider.

Figure 4–1 Two-Room Campus Cluster With Host-Based Data Replication (No Multipathing)

Figure 4–1 is similar to a standard noncampus configuration. The most obvious difference in a campus cluster is that Fibre Channel switches have been added to switch from multimode to single-mode fibers.