I have two data centers, each with two Exchange 2013 servers in them. The servers are configured as a DAG for fail over. The servers are also load balanced by third party hardware and spam is handled by onsite iron port. The issue I am having is that two of the servers in a remote data center are running on older hardware then the local data center hardware and I would like to remove the remote data center Exchange servers from the DAG. I am thinking that I can remove the two servers from the DAG and then remove the databases from the two remote servers. At that point I am guessing that they would just be front end servers for the end users.
Does anyone have any suggestions on what I should do in this given situation? Any help would be grateful.