The cluster design must take into account the workload that the cluster must handle.

vSphere Cluster Design Decision Background

The following heuristics help with cluster design decisions.

  • Decide to use fewer, larger hosts or more, smaller hosts.

    • A scale-up cluster has fewer, larger hosts.

    • A scale-out cluster has more, smaller hosts.

    • A virtualized server cluster typically has more hosts with fewer virtual machines per host.

  • Compare the capital costs of purchasing fewer, larger hosts with the costs of purchasing more, smaller hosts. Costs vary between vendors and models.

  • Evaluate the operational costs of managing a few hosts with the costs of managing more hosts.

  • Consider the purpose of the cluster.

  • Consider the total number of hosts and cluster limits.

Figure 1. vSphere Logical Cluster Layout

vSphere Logical Cluster Layout