Two preemptive waits track Windows Server Failover Clustering API calls, and this page covers both: PREEMPTIVE_OS_CLUSTEROPS (the generic bucket for cluster operations) and PREEMPTIVE_CLUSAPI_CLUSTERRESOURCECONTROL (calls to the cluster resource control API, querying and manipulating cluster resource properties).
Failover Cluster Instances and Availability Groups both live with one foot in WSFC, so cluster-aware instances accumulate these routinely; standalone instances should barely see them.
Are They a Problem?
Normally no; they are the same story as HADR_CLUSAPI_CALL, cluster plumbing being consulted as designed, and they belong on the benign filter list for clustered environments. Their forensic use matches too: during incident review of failovers, lease timeouts, or RESOLVING states, unusual durations in these waits corroborate that WSFC itself was slow to answer, pointing the investigation at the cluster log rather than the database engine.
Day to day, read past them.
What To Do
- Filter them in routine analysis on clustered instances.
- During cluster incidents, line their anomalies up with the cluster log and system event log timestamps.
- No SQL-side tuning exists; cluster responsiveness is a platform property.
How To See It
Rank waits with Get-WaitStatistics; expect a steady background presence on FCIs and AG nodes, meaning nothing until an incident timeline needs it.
Part of the SQL Server Wait Types Library.
Related deep dive: HADR_SYNC_COMMIT Wait Type.
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