Virtualization deployments along with any technology typically need to grow with the business. Previously, this was accomplished by racking more servers or overbuying initially.  Because workloads are now consolidated onto fewer servers in clusters there are a few additional options.  All of them are below:

  • Overbuy initially.
  • Scale up by adding hardware to existing hosts including RAM, CPU, and hard-disk space.
  • Scale out by adding hosts to spread the workload.

Clusters typically have a maximum amount of nodes that can be included.  Newer versions up the ante:

  • Windows Server 2012 – 64 nodes
  • Windows Server 2008 R2 – 16 nodes
  • Windows Server 2008 – 8 nodes