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I have a Windows failover cluster up and running, with a primary and secondary server.
I have also created an Always On Availability Group with the two servers, with both the primary and the secondary replica being synchronous replicas.
I now want to add an additional asynchronous replica to the Always On Availability Group; to do so, do I need to modify the Windows failover cluster?
I now want to add an additional asynchronous replica to the Always On Availability Group; to do so, do I need to modify the Windows failover cluster?
Depends on how you want to do it. If you're adding an instance on another server, then that other server must be added to the WSFC in your current deployment as AGs can't span differing clustering environments.
If you don't want HA but DR/BC, then it's possible to not use a cluster by using read-scale AGs, which do not require clustering.
