I'm in the process of installing Exchange 2010 into an Exchange 2003 FE/BE environment. For budgetary purposes and to make best use of the existing new hardware I am planning to install the CAS, HT and MBX roles on both new servers. I am also planning to setup a CAS array and a DAG, except I will not load balance the CAS array due to Microsoft limitations and no external hardware load balancer. With that said, I need clarification on the naming convention of the DAG, CAS array and Internet facing name space.
If I want the OWA name to be mail.domainname.com, do I use this same name for the CAS array and/or DAG name?
When prompted for the Internet facing name during the CAS install, will I input the same name during the installation on both CAS servers or is this going to throw an error? If I am not load balancing, I'm confused how both servers can have the same OWA address/configuration?