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ERROR_NONCORE_GROUPS_FOUND
Destroying a cluster is different from removing its application roles
ERROR_NONCORE_GROUPS_FOUND means the cluster still contains non-core application groups. The destroy operation removes cluster configuration from the nodes; it is intentionally blocked while clustered roles and their resources remain, because deleting the cluster would orphan application, storage, and network configuration without an orderly role cleanup.
Enumerate groups and distinguish core groups from application groups. Move or shut down workloads as required, preserve application data, remove each clustered role and its resources through supported tools, and then run cluster removal. Do not delete the cluster database or service registry manually to bypass this safety check; that can leave Active Directory objects, storage reservations, or application metadata inconsistent.
Cleanup order before cluster destruction
- Inventory application groups and their resources.
- Preserve or migrate workload data and identities.
- Remove clustered roles, then unused resources and resource types.
- Destroy the cluster and clean up directory objects last.
References
- Microsoft: removing clustered roles and resources
- Microsoft: destroying a failover cluster
- Microsoft: cluster resources and ownership model
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