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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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High Availability

Redundancy for the Director role is provided in the same way as with Front End Servers and requires adding more Directors to a pool. Also like a front-end pool, up to 10 servers can be defined in a Director pool. Load balancing is achieved through the same methods as Front End Servers by providing multiple IP addresses, which resolve to the pool name of the Directors. If one IP address is unavailable, the endpoint attempts to log in to another IP address provided for the pool in DNS.

Tip

Plan for high availability in the environment from the start even if multiple Directors do not deploy initially. Completing the planning and configuration for high availability simplifies the deployment later and requires nearly no changes ...

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