In this Multi Part Article, I going to show you how to setup SQL AlwaysOn whish is very much supported for Skype For Business.
Select New SQL Server Stand-alone and click Next
Since I am installing in Test lab, I going with the Evaluation Version
Select Database Engine Services and management Tools-Basic, Management Tools-Complete
Set Startup Type Automatic and Click Next
Select the Administrator Account and Click Next
Open SQL Server Configuration Manager and Click on SQL Server Properties
Select Enable AlwaysOn Availability Groups and Click Apply
You can see the Second server added and database also synchronized.
How to install SQL 2014 with SQL AlwaysOn for Skype for Business-Part 1
How to install SQL 2014 with SQL AlwaysOn for Skype for Business-Part 2