I've built a simple IIS 8 web farm on Azure VMs. The web farm has 3 instances (Windows Server 2012) using shared configuration. The load balancing is handled by the Azure's built-in load balancer.

There's much discussion about IIS Application Request Routing but I wonder what would I gain if I add it to my current web farm? I presume I could use ARR in situations where one of the servers has more resources so that more traffic is directed to that instance? Is there other benefits?


One of the benefits of ARR as of Nov 2014, is the it provides client affinity to your HTTP requests. As of now, the Azure load balancer / traffic manager does not provide this.

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