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In a basic cluster structure, a group of computers are linked and work together as a single computer. Clusters are deployed to improve performance and availability. Based on how these computers are linked together, cluster structure is classified into two types:

 Symmetric clusters

 Asymmetric clusters

Symmetric cluster is a type of cluster structure in which each node functions as an individual computer capable of running applications. The symmetric cluster setup is simple and straightforward. A sub‐network is created with individual machines or machines can be added to an existing network and cluster‐specific software can be installed to it. Additional machines can be added as needed. Figure 2.3 shows a symmetric cluster.

Asymmetric clusters are a type of cluster structure in which one machine acts as the head node, and it serves as the gateway between the user and the remaining nodes. Figure 2.4 shows an asymmetric cluster.

Figure 2.3 Symmetric clusters.

Figure 2.4 Asymmetric cluster.