SQL Server Distributed Availability Group Migration Guide
Blog post from Tessell
A Distributed Availability Group (DAG) is a specialized SQL Server feature that connects two distinct availability groups across different clusters, enabling seamless data replication without a shared Windows Server Failover Cluster (WSFC). Introduced in SQL Server 2016, DAGs facilitate cross-cloud migrations, version upgrades, and disaster recovery by allowing continuous data replication between source and target environments, such as on-premises to cloud platforms like Tessell. Unlike traditional Always On Availability Groups, which require a single WSFC, DAGs operate independently across various data centers, clouds, or domains, using a two-tier forwarding model to efficiently manage log streams. This approach eliminates cluster boundary constraints and supports scenarios where environments cannot share a WSFC, making it ideal for large-scale SQL Server migrations with minimal downtime and near-zero data loss. The migration process involves provisioning the target, establishing the DAG with either automatic or manual seeding, and executing a controlled failover after ensuring synchronization, with post-migration tasks such as re-enabling Tessell triggers and updating application connection strings to complete the transition.
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