Cluster System Requirements

Verify Microsoft Windows 2003, 2008, 2008 R2 is installed on all computers in the cluster. Typical clusters consist of five (5) machines:

Windows Server 2008 R2 Failover Cluster (x64) as a domain controller and DNS server.
Several virtual machines running Windows 2008 R2 (x64), joined to the same domain controlled by the first server.
A fifth machine running FreeNAS.
Microsoft .NET Framework 3.5 (or later) on all cluster nodes.

Important! Application data and logs must reside on the same volume.

For more information, refer to the Microsoft documentation to make sure your cluster environment is correctly configured.