AB Suite provides the optional ability to separate the application layer from the database layer. This allows the Database and Application to reside on different machines. Hence clustering for AB Suite can consist of two separate components, the Application layer and the Database layer. The exact cluster configuration varies as per requirements. You need to create a Resource Group for AB Suite if you use a separate cluster for the Application layer. Otherwise you can have a single cluster where both AB Suite and SQL Server are a part of the same Resource Group and so will fail over together.