As an organization’s document management and collaboration needs to grow, the SharePoint farm needs to grow with it. Figure 2.3 illustrates a mid-sized SharePoint farm with six total servers.
Figure 2.3. Viewing a sample mid-sized SharePoint farm.
In this configuration, the web role is now separate from the service application roles, which increases performance. In addition, Network Load Balancing (NLB) is used between the web role servers to provide for availability, and the SQL servers are clustered to provide for HA and DR of the database tier. This type of environment can easily scale into the tens of thousands of users.