Enterprise Pool Topologies
Communications Server 2007
In Office Communications Server 2007, two types of Enterprise Pool topologies are supported:
Enterprise pool in the consolidated topology. One or more Enterprise Edition servers in a pool, each running all server roles: Front-End, A/V Conferencing, and Web Conferencing, as well as IIS for the Web Components. A single Enterprise Edition server, configured as an Enterprise pool, without a hardware load balancer and with a separate Back-End Database server, is supported. A hardware load balancer is required if two or more Enterprise Edition servers make up the pool. The consolidated topology can support up to 30,000 active, concurrent users.
Enterprise pool in the expanded topology. Each server role on a dedicated computer. The Front End Servers and Web Component Servers (IIS servers) are connected to a hardware load balancer. Separate load balancers for the A/V Conferencing Server and the Web Conferencing Server and a single load balancer for both are supported configurations. The expanded topology is for larger enterprises that require high availability and scalability to support mission-critical IM and conferencing internally. A single Enterprise pool in an expanded configuration can support up to 125,000 active, concurrent users.