Clustering
Windows Server 2003 supports two different kinds of clustering, either of which can greatly improve your fault tolerance:
For many TCP/IP-based applications, the Network Load Balancing service provides a simple, “shared nothing,” fault-tolerant application server.
Server clusters provide a highly available fault-tolerant environment that can run applications, provide network services, and distribute loads. Server clusters are only available with Windows Server 2003, Enterprise Edition and Windows Server 2003, Datacenter Edition.
Network Load Balancing
The Network Load Balancing service (called Windows Load Balancing Service in Microsoft Windows NT 4) allows TCP/IP-based applications to be spread dynamically across up to 32 servers. ...
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