[AlwaysOn] 创建SQL Server高可用性组T-SQL语法：CLUSTER_TYPE参数

CLUSTER_TYPE = { WSFC | EXTERNAL | NONE }

在SQL Server 2017中引入。Introduced in SQL Server 2017.

用于标识可用性组是否位于Windows Server故障转移群集(WSFC)上。Used to identify if the availability group is on a Windows Server Failover Cluster (WSFC). 当可用性组位于Windows服务器故障转移群集上的故障转移群集实例上时，设置为WSFC。Set to WSFC when availability group is on a failover cluster instance on a Windows Server failover cluster. 当群集由非Windows服务器故障转移群集(如Linux Pacemaker)的群集管理器管理时，设置为EXTERNAL。Set to EXTERNAL when the cluster is managed by a cluster manager that is not a Windows Server failover cluster, like Linux Pacemaker. 当可用性组不使用WSFC进行群集协调时，设置为“NONE”。 Set to NONE when availability group not using WSFC for cluster coordination. 例如，当一个可用性组包含没有集群管理器的Linux服务器时。For example, when an availability group includes Linux servers with no cluster manager.