For windows 2003 cluster, check my old tutorial on following link. https://technochat.in/2008/11/configure-cluster-on-vmware-using-iscsi/ Windows 2008 R2 Cluster Requirements: 1. Two Systems with Same Hardware Configuration. 2. Two Network Card 3. Windows 2008 R2 Enterprise Edition on both systems with same patch level. 4. Active Directory 5. Shared Storage( SAN or iSCSI) 6. Both servers should be the member of same domain.