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Network Load Balancing and Server Clustering

SDL Tridion Sites supports Network Load Balancing and Server Clustering.

Network Load Balancing
This clustering method only clusters the network layer. Either Windows or a hardware load balancer can be in charge of balancing the network requests between the clustered servers. Load balancing is useful when performance and scalability is needed in IIS.
Server Clustering
This method makes multiple machines act as a single machine, sharing disk space and providing fail-over support, to create a fault-tolerant system.

Microsoft's online documentation resources explain how to set up these clusters: