So, if a database or server fails, a failover occurs and the load balancer(s) redirects the traffic to a remaining Client Access Server. Essentially a DNS record pointing to a Load Balancer.Ī Hardware Load Balancer (HLB) is Microsoft's recommended way to enable redundancy and load balance this entry point (BTW: On TechEd 2010 Europe, the Microsoft Exchange team mentioned that it does not recommend it’s own Windows NLB solution anymore). When using a DAG the single point of entry for your clients and for all protocols (including MAPI RPC), is the Client Access Array (or CAS Array). DAG supplies us with mailbox database redundancy. It is a different approach with previous versions of Exchange, who leverage server redundancy. When realizing a High Available Exchange 2010 environment, you automatically going to use DAG ( Database Availabilty Groups).
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