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What is multi-subnet failover?
A SQL Server multi-subnet failover cluster is a configuration where each failover cluster node is connected to a different subnet or different set of subnets. Therefore, a multi-subnet failover cluster provides a disaster recovery solution in addition to high availability.
What is multi-subnet Alwayson availability group?
A SQL Server multi-subnet failover cluster is a configuration where each failover cluster node is connected to a different subnet or different set of subnets. These subnets can be in the same location or in geographically dispersed sites.
How to add a secondary replica to an always on availability group?
This topic describes how to add a secondary replica to an existing Always On availability group by using SQL Server Management Studio, Transact-SQL, or PowerShell in SQL Server. You must be connected to the server instance that hosts the primary replica.
How to add a secondary replica in SQL Server?
To add a replica. Connect to the instance of SQL Server that hosts the primary replica. Add the new secondary replica to the availability group by using the ADD REPLICA ON clause of the ALTER AVAILABILITY GROUP statement. The ENDPOINT_URL, AVAILABILITY_MODE, and FAILOVER_MODE options are required in an ADD REPLICA ON clause.
Do you have to be connected to SQL Server to use always on availability groups?
You must be connected to the server instance that hosts the primary replica. For more information, see Prerequisites, Restrictions, and Recommendations for Always On Availability Groups (SQL Server).
What happens if I remove an availability replica?
If you remove an availability replica, simply delete the backup job from the server instance that hosted that replica. If you use the Maintenance Plan Wizard to create a given backup job, the job will automatically include the scripting logic that calls and checks the sys.fn_hadr_backup_is_preferred_replica function.