Microsoft SQL Always On Availability Group is effectively a SQL mirroring cluster. 

In a Microsoft SQL Always On Availability Group, there is one single primary replica, aka, the active database, and up to 8 secondary replicas, aka, the passive databases.

Setting up a HA cluster with a Microsoft SQL Always-on Availability Group is very simple. All you have to do is to clone the primary DualShield server to the secondary server machine.