Failover Cluster Infrastructure Requirements
Key Points
Failover clusters depend on infrastructure services, and require that each server node must be in the same Active Directory® domain and, if you use DNS, the nodes should use the same Domain Name System (DNS) servers for name resolution.
We recommend that you install the same Windows Server 2008 features and roles on each node. In addition, you should not install the Active Directory Domain Services (AD DS) role on any of the cluster nodes. If you install the AD DS role on one of the nodes, you must install it on all nodes.
For more information, see "Failover Cluster Help: Understanding Requirements for Failover Clusters"
Failover Cluster Software Requirements
Key Points
Failover clusters require that each cluster node run the same edition of either Windows Server 2008 Enterprise, or Windows Server 2008 Datacenter. Depending on the role that will be clustered, Server Core edition may also meet the software requirements. However, you cannot install Server Core and full editions in the same cluster.
Each node must run the same processor architecture. This means that each node will have the same processor family, which might be Intel Xeon processor with Extended Memory 64Technology®, AMD Opteron AMD64, or Intel Itanium-based.
For more information, see "Failover Cluster Help: Understanding Requirements for Failover Clusters"
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