Appendix C: Choosing a Cluster Technology for IIS 6.0
Windows Server 2003 supports three different cluster technologies: Server cluster, which is the Windows Server 2003 name for the Microsoft technology first made available as Microsoft Cluster Server (MSCS) in Windows NT Server 4.0, Enterprise Edition; Network Load Balancing (NLB); and Component Load Balancing (CLB). These Microsoft clustering technologies can be key ingredients in improving availability, reliability and scalability. The following table compares the purposes and uses of the three cluster technologies.
Limitations of clusters
While a well-designed solution can guard against application failure, system failure and site failure, cluster technologies do have the following limitations: