Upper Tier Architecture

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Upper Tier Architecture

The Upper Tier architecture is designed to support more than 20,000 users. It includes both dedicated servers, and servers running more than one role:

  • Four servers running Edge Services

  • Four servers running Client Access and Unified Messaging server roles

  • Three servers running Hub Transport Services

  • Fourteen cluster continuous replication (CCR) clusters (a total of 40 physical servers)

    Note

    Customers looking for a lower total cost of ownership (TCO), lower service-level agreement (SLA) solution could run 14 local continuous replication (LCR) servers instead. Customers who have already invested in traditional multinode, single-copy clusters could continue to use this method of clustering.

  • Four Active Directory directory service Domain Controllers

The following figure shows the architecture for an Upper Tier deployment.

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Figure: Architecture for Upper Tier deployment