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Chapter 3. Scaling with ColdFusion MX 7 > Hardware Load-Balancing Options

Hardware Load-Balancing Options

Hardware load balancing, similar to software balancing with ColdFusion MX 7 Load Balancing, manages traffic within a Web cluster according to a specified load-balancing algorithm (such as round robin, or least connections). However, unlike ColdFusion MX 7 Load Balancing, hardware-based load-balancing devices sit in front of the Web cluster, meaning that all traffic destined for the Web cluster must pass through the load-balancing device.

Suppose you are configuring a Cisco LocalDirector to load-balance the www.mycompany.com domain, which contains three Web servers and a database server. You would configure the load balancer with the IP address that corresponds, DNS-wise, to www.mycompany.com. This address is called the virtual Web server address. On the LocalDirector, you would also configure the addresses of the three Web servers behind the LocalDirector and a load-balancing algorithm, such as least connections. LocalDirector would assign users to the server with the least load. Figure 3.12 illustrates the basic network configuration of the load balancer.


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