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  •  It makes no sense to do clustering on top of virtualization, as the virtualization provides the necessary hardware fault tolerance. For example, vSphere provides two features, depending on your needs: HA or FT. Others will Other solutions have similar approaches.

  • When creating snapshots of the appliance, the OS is frozen briefly, which can trigger the failover of the cluster, which in turn will leave you in a split-brain situation. The split-brain happens, due to the fact, that the frozen node will unfreeze shortly thereafter, while still considering itself the primary. As the secondary node took over, one now has two primary nodes, commonly known as a split-brain.

  • Network issues on the hypervisor level can affect the cluster in ways that are not obvious. Hence, impacting the cluster and making troubleshooting difficult.

  • Generally speaking, you add a level of complexity into an already complex environment, which, in general, you want to avoid.

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