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What is the difference between Always On Clustered and Always On Clusterless
09 January,2023 by Tom Collins
Question : What is the difference between Always On Clustered and Always On Clusterless ?
Answer: It is important to distinguish between these two flavours - Clustered vs Clusterless .
Version 1 - Clustered Availability Groups aka "Standard" Availability Groups which include Windows Server failover cluster . Introduced on SQL Server 2012
Primary Purpose is to offer High Availability
Version 2 - Clusterless aka Read Scale Availability Groups . Introduced on SQL Server 2017
Primary Purpose is to scale out read work loads. There is no HA capacity. Essentially there is no Cluster under the hood . Although there is no HA capacity - it is possible to utilise Clusterless as a DR solution with a synchronous commit setup and manual failover
Read more on Always On Availability Groups
How to restore Always On Availability Group databases
How to get the Always On Availability Group DNS name per database
Quick access to SQL Server Always On Availability cheatsheet
How to get Cluster File Share Witness sharepath with Powershell
Author: Tom Collins (http://www.sqlserver-dba.com)
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