I am in the process of setting up a new domain with all of the servers being virtualized using VMware. At the moment, I am working on installing and configuring Exchange 2013. I will be exporting all of the mailboxes out of our current production Exchange 2003 server and importing them into Exchange 2013 on the new domain. Our current Exchange Server has roughly 50 mailboxes with a total size of 70 GB.
I have been reading a lot about Database Availability Groups in Exchange 2013. However, I am wondering if using DAGs is recommended / necessary in my environment. I am running two VMware ESX hosts with HA turned on so if one host fails the VMs will be migrated to the other host so that no server is down for an extended period of time. All of my VMs / Data reside on a SAN. Since I already have HA configured with VMware, is there much advantage to installing two Exchange Servers and using a DAG?