As explained before, the failover cluster in Windows Server is a feature that you can enable to support the application on which you want to ensure HA. In order to enable and configure failover cluster, you have to attend to some prerequisites. Let's first understand how failover cluster works, to see how these prerequisites are important.

On a regular standalone virtualization host, as you've seen so far, a VM is placed entirely on the host. Checkpoints, disks, configuration, and so on, everything is in the host disk. If this host fails, the VM will fail too. What failover tries to create is a mechanism to fail over the VM to a healthy host. To understand that, look at the following diagram:

On a failover cluster, Hyper-V will host VM execution, just like a standalone host. However, all the VM files will be placed on a shared storage location. If the host fails, the cluster services notify the next available host and, as the host is able to...