System requirements: Database mirroring

Item	Requirement
BlackBerry Enterprise Service 10 databases	Database mirroring is supported for both BlackBerry Enterprise Service 10 databases: BlackBerry Configuration Database (BlackBerry Device Service) Management Database (Universal Device Service) If you want to use database mirroring, you must configure it for both databases. Create the mirror databases on the same computer (the mirror server), in the same instance of Microsoft SQL Server.
Microsoft SQL Server	Configure database mirroring using a version of Microsoft SQL Server that BlackBerry Enterprise Service 10 supports. To view the compatibility matrix, visit www.blackberry.com/go/compatibility. Verify that your organization’s version of Microsoft SQL Server supports database mirroring.
Operating mode	Configure database mirroring using high-safety mode with automatic failover.
Witness	A witness server is required for automatic failover. The witness should be a different server instance than the principal server and the mirror server. For more information, see Database Mirroring Witness – SQL Server 2008 R2 or Database Mirroring Witness – SQL Server 2012.
Location of databases	Create the mirror database on a different computer than the principal database.
Version parity	The Microsoft SQL Server that hosts the mirror database should be the same version and edition as the Microsoft SQL Server that hosts the principal database.