Upgrading an engine involves quiescing and enabling the datasets.
Tunable default value description
By default, the MSSQL_ALLOW_QUIESCE_AG_VIRTUAL_SOURCES is set to true, upgrade attempts quiesce for the AG virtual database. If set to false, quiesce will not be attempted.
Upgrade concerns
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Fast disable is not supported for the SQL Server AG virtual database. Thus, quiesce for SQL Server AG virtual database will always unmount and unexport the dataset.
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Quiescing of the SQL Server AG virtual database is only performed when the SQL Server AG virtual database is in Running status.