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Specify Availability Group Options Page for an Always On Availability Group

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Applies to: yesSQL Server (all supported versions)

This topic describes the options of the Specify Availability Group Name page. This topic is used by both the New Availability Group Wizard and Add Database to Availability Group Wizard of SQL Server.

Specify Availability Group Options

Availability group name
Specify the name of the availability group. For a new availability group, specify a valid SQL Server identifier that is unique across all availability groups in the Windows Server failover cluster (WSFC). The maximum length for an availability group name is 128 characters.

Cluster type Next, specify the cluster type. The possible cluster types depend on the SQL Server version and operating system. Choose one from the following list:

  • Windows Server Failover Clustering

    Use when the availability group is hosted on instances of SQL Server that belong to a Windows Server failover cluster for high availability and disaster recovery. Applies to all supported versions of SQL Server.

  • EXTERNAL

    Use when the availability group is hosted on an instance of SQL Server that is managed by an external cluster technology for high availability and disaster recovery, for example Pacemaker on Linux. Applies to SQL Server 2017 (14.x) and later.

Important

Do not choose cluster type = EXTERNAL on a Windows platform. Doing so will result in the availability group going into a resolving state and will prevent you from removing databases from the availability group.

  • NONE

    Use when the availability group is hosted on an instance of SQL Server that is not managed by a cluster technology for read scale and load balancing. Applies to SQL Server 2017 (14.x) and later.

Database level health detection Check this box to enable database level health detection (DB_FAILOVER) option for the availability group. The database health detection notices when a database is no longer in the online status, when something goes wrong and will trigger the automatic failover of the availability group. See SQL Server Always On Database Health Detection Failover Option.

Select Databases Page (New Availability Group Wizard and Add Database Wizard)

Related Tasks

See Also

Overview of Always On Availability Groups (SQL Server)