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SQL 2017 Always-on no cluster
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5/17/2018 12:57:24 PM
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Setting up always-on availability group with no cluster.
So far works good, though some of our backup and monitoring queries began failing, specifically the function, sys.fn_hadr_backup_is_preferred_replica
Msg 35222, Level 16, State 0, Line 1 Could not process the operation. Always On Availability Groups does not have permissions to access the Windows Server Failover Clustering (WSFC) cluster. Disable and re-enable Always On Availability Groups by using the SQL Server Configuration Manager. Then, restart the SQL Server service, and retry the currently operation. For information about how to enable and disable Always On Availability Groups, see SQL Server Books Online.
We ended up working around this by checking the sys.availability_groups which has a column for cluster type, this way we can check if the always-on group has a cluster or not.
-- This leads to error select [master].sys.fn_hadr_backup_is_preferred_replica('ao_test') go select CASE WHEN dbrs.is_primary_replica = 1 and ag.cluster_type = 1 then 1 when dbrs.is_primary_replica = 0 and ag.cluster_type = 1 then 0 WHEN ag.cluster_type is null then 0 else Convert(int,[master].sys.fn_hadr_backup_is_preferred_replica(sd.[name])) end as preferred_replica_backup From sys.databases sd LEFT OUTER JOIN master.sys.dm_hadr_database_replica_states AS dbrs ON sd.group_database_id = dbrs.group_database_id and dbrs.is_local = 1 left outer join master.sys.availability_groups ag on ag.group_id = dbrs.group_id where sd.[name] = 'ao_test'
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