Brick Model and User Data Replication
Another welcome change in Lync Server 2013 is the addition of the Brick Model within Front End pools. One of the investments made was to reduce the dependency on the backend SQL server database’s availability so that users should be unaware if database issues are occurring. The Brick Model moves more functionality into each Front End Server, which now manages the user’s presence states directly. Changes to the backend database are done only for persistent data and are considered lazy writes, so a temporary issue at the database doesn’t have a high impact on users.
Users are now automatically partitioned into objects called UserGroups within a Front End pool, similar to how each user had a preferred server ...
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