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Clustering an existing SQL server 2018 instance without disruption - possible?

Veli-Jussi Raitila 446 Reputation points
2022-02-16T08:55:25.84+00:00

Is it possible to set up AlwaysOn clustering on an existing SQL server installation without a service break?

The database in question is SQL Server 2018 SP1 (AlwaysOn BAG).

SQL Server Other
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  1. Olaf Helper 47,426 Reputation points
    2022-02-16T09:18:07.94+00:00

    If you setup the cluster role for a Windows server, then a restart is required; so no, it's not possible.
    Anyway, changing an existing SQL Server into a cluster is also not possible; you have to setup Windows cluster before you install SQL Server.

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