Middle Tier Architecture
Middle Tier Architecture
The Middle Tier architecture is designed to support between 5,000 and 20,000 users. It includes both dedicated servers and servers running more than one role:
Two servers running Edge Services
Two servers running Client Access and Unified Messaging server roles
Two servers running Hub Transport Services
Three cluster continuous replication (CCR) clusters (a total of 6 physical servers)
Note
Customers looking for a lower-TCO, lower-SLA solution could run five local continuous replication (LCR) servers instead.
Two Active Directory directory service Domain Controllers
The following figure shows the architecture for a Middle Tier deployment.
Figure: Architecture for Middle Tier deployment