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Sun Cluster Concepts Guide for Solaris OS

Recommended Quorum Configurations

For examples of quorum configurations to avoid, see Bad Quorum Configurations.

Quorum in Two–Node Configurations

Two quorum votes are required for a two-node cluster to form. These two votes can come from the two cluster nodes, or from just one node and a quorum device.

Figure 3–2 Two–Node Configuration

Illustration: Shows Node A and Node B with one quorum device that is connected to two nodes.

Quorum in Greater Than Two–Node Configurations

It is valid to configure a greater than two-node cluster without a quorum device. However, if you do so, you will not be able start the cluster without a majority of nodes in the cluster.

Illustration: Config1: NodeA-D. A/B connect to (->) QD1. C/D -> QD2. Config2: NodeA-C. A/C -> QD1. B/C -> QD2. Config3: NodeA-C -> one QD.