This wizard runs validation tests to determine whether this configuration of servers and attached storage is set up correctly ...

This wizard runs validation tests to determine whether this configuration of servers and attached storage is set up correctly to support failover. A cluster solution is supported by Microsoft only if the complete configuration (servers, network, and storage) passes all tests in this wizard. In addition, all hardware components in the cluster solution must be "Certified for Windows Server 2008".  If you want to validate a set of unclustered servers, you need to know the names of the servers. Important: the storage connected to the selected servers will be unavailable during validation tests.  If you want to validate an existing failover cluster, you need to know the name of the cluster or one of its nodes.  You must be a local administrator on each of the servers you want to validate.  To continue, click Next.