SQL Server Backend High-Availability
Lync Server relies on a SQL Server backend to support the environment. In previous versions, a SQL Enterprise Cluster was required to provide high-availability to SQL. However, Lync Server 2013 introduces support for SQL Server mirroring, and SQL Clustering is no longer supported. SQL mirroring introduces a primary and secondary model for the backend database. Essentially, the primary publish (SQL Server 1) will copy all databases to the secondary subscriber (SQL Server 2). This happens after every SQL transaction has been completed. Each transaction is then committed to the mirror, resulting in an always-up-to-date copy of the information.
In the event of a SQL Server failure, the mirror server takes over. ...
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