[SQL Architecture Discussion] Multiple AG groups in one Windows failover cluster

  • In an organisation I found the following setup:
    Six VM SQL1 to SQL6 in the same domain, each host two instances. They are in four AG groups.
    AG1:
    SQL1\INS1, SQL3\INS1, SQL5\INS1
    AG2:
    SQL1\INS2, SQL3\INS2, SQL5\INS2
    AG3:
    SQL2\INS3, SQL4\INS3, SQL6\INS3
    AG4:
    SQL2\INS4, SQL4\INS4, SQL6\INS4

    However, all the AG groups are in one Windows failover cluster CLUS1. I would like to hear your opinions and pros/cons to have all AG groups in one cluster (license cost, perfromance, high availability and etc.)

    * They don't use Failover Cluster Instance of SQL Server. Only AG groups and Windows Server Failover Cluster.

    Many thanks!

  • An AG allows failing over multiple database at the same time for example if the are interdependencies.

  • already answered and discussed here

    https://www.sqlservercentral.com/Forums/1912286/Multiple-AG-groups-in-one-Windows-failover-cluster

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