REQUIRED_SYNCHRONIZED_SECONDARIES_TO_COMMIT relates to replicas in synchronous commit mode. When replicas are in synchronous commit mode, writes on the primary replica wait until writes on synchronous replicas commit to the replica database transaction log. If a SQL Server that hosts a secondary synchronous replica stops responding, the SQL Server that hosts the primary replica marks that secondary replica as NOT SYNCHRONIZED and proceeds. When the unresponsive database comes back online it will be in a "not synced" state and the replica is marked as unhealthy until the primary can synchronize it again. This setting guarantees that the primary replica does not proceed until the minimum number of replicas have committed each transaction. If the minimum number of replicas is not available, then commits on the primary fail. For cluster type `EXTERNAL` the setting is changed when the availability group is added to a cluster resource. See [High availability and data protection for availability group configurations](../../linux/sql-server-linux-availability-group-ha.md).
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