![]() ![]() The availability group's virtual network name resource is then transferred to that instance.Īt any given moment, only a single SQL Server instance may host the primary replica of an availability group's databases, all associated secondary replicas must each reside on a separate instance, and each instance must reside on separate physical nodes. In the event of a failover, instead of transferring ownership of shared physical resources to another node, WSFC is leveraged to reconfigure a secondary replica on another SQL Server instance to become the availability group's primary replica. The availability group and a corresponding virtual network name are registered as resources in the WSFC cluster.Īn availability group listener on the primary replica's node responds to incoming client requests to connect to the virtual network name, and based on attributes in the connection string, it redirects each request to the appropriate SQL Server instance. Each replica is hosted by an instance of SQL Server on a different node of the WSFC. ![]() An availability group consists of a primary availability replica and one to four secondary replicas that are maintained through SQL Server log-based data movement for data protection without the need for shared storage. The following diagram shows an AD FS SQL Server Farm with AlwaysOn Availability group.Īn Always On Availability Group (AG) is a one or more user databases that fail over together. The availability group listener is what the client (the AD FS security token service) uses to connect to SQL. Overview - AlwaysOn Availability Groupsįor more information on AlwaysOn Availability groups, see Overview of AlwaysOn Availability Groups (SQL Server)įrom the perspective of the nodes of an AD FS SQL Server farm, the AlwaysOn Availability group replaces the single SQL Server instance as the policy / artifact database. The following guide will walk through an overview of AD FS with SQL Always on Availability Groups and provide deployment considerations and guidance. Improved performance: You can use the suggested deployment to provide a high-performance AD FS infrastructureĪD FS can be configured for a highly available geo-distributed scenario.Elimination of a single point of failure: With failover capabilities, you can achieve a highly available AD FS infrastructure even if one of the data centers in a part of a globe goes down.A highly available geo-distributed topology provides: ![]()
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