I am attempting to setup Exchange High Availability in 2010. However I have run into a few issues and am trying to figure out what I am doing wrong, although it may just be a product of the way my environment is.
We have multiple sites , one of these sites is used for primary and other is used for DR. All sites are broken up by subnets ex.
Site A - 192.168.1.x (Client Network), 10.0.x.x (Server Network)
Site B - 192.168.2.x
I have setup a DAG spread across the two sites, with one server in each location that is holding all Exchange roles. My witness server is located in the DR location. All appears good as Exchange reports I have a Healthy copy of each of my DBs. In recent tests I shut down my primary Exchange Server, I did not see the DB's come up on my backup server nor was I able to connect to my DB using my OL client. Although I believe the Outlook Client issue is probably because I did not tell my client to look to the new CAS.
My question is given this scenario can you give me what you feel is the best way to set this up?
I thought about setting up a CASArray but I don't think that will help since NLB does not work over multiple subnets. Should I install the CAS role on my witness server, then point all clients to it?