How do we license SQL Server as a Lync Backend Solution correctly.This is not an very easy question.
But first in general the common SQL licensing applies. This is mainly regarding if you license as per CPU or Server. This question will mainly not have an impact regarding Lync based licensing.
Lync Server Enterprise Deployment requires an SQL Server instance. this is fact, as well as several other Lync Server or Components (e.g. pChat or monitoring and Archiving)
We have a few SQL Backend scenarios:
1. Single SQL Server
This solution do not provide an HA feature, either the Server, nor the database.
But it is possible in adding this server deployment into an mirrored solution(3.)
2. Clustered SQL Server (with a single Database)
This provides only HA for the Server themselves, but the Database is not protected.
Well some solution exists, where the storage is in a mirrored relationship and there provide database HA in another tier. But a storage mirr…