We are deploying exchange for approx 2000 users. What would be best practice plan for the number of servers. This is all on one AD site. No DR. No Edge
5 servers total (approx)
2 cas servers with casarray (ht and cas roles)
1 ht server as witness
2 mailbox servers split with 1000 users on each. How would the architecture look like for DAG and would it be the correct layout above? thanks