ERROR_CLUSTER_SINGLETON_RESOURCE - 5940 (0x1734)
Only one instance of this resource type is allowed in the cluster.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_CLUSTER_SINGLETON_RESOURCE error indicates that a resource type is configured to be used only once within the cluster environment. This means that multiple instances of this specific resource cannot coexist in the same cluster, as it would violate the cluster's configuration and potentially lead to operational inconsistencies or conflicts.
Error Details
This error typically arises when attempting to add or manage a resource type that is already defined as a singleton within the cluster. A singleton resource ensures exclusivity, meaning only one instance of this particular resource can be active at any given time in the cluster environment.
Usage Context
The ERROR_CLUSTER_SINGLETON_RESOURCE error is relevant in scenarios where resources are managed and configured for high availability or load balancing within a Windows Failover Cluster. It is commonly encountered during operations such as adding, removing, or modifying resource types that have been designated as singletons.
Developer Interpretation
Developers should interpret this error to indicate that the operation being attempted conflicts with the cluster's configuration rules for singleton resources. This could be due to an incorrect parameter value, an invalid object type, or exceeding predefined limits within the cluster environment. Developers must ensure that resource types are correctly configured and that operations adhere to the cluster’s singleton constraints.
Related Errors
ERROR_CLUSTER_RESOURCE_TYPE_NOT_FOUND(1208)ERROR_CLUSTER_INVALID_NODE(1236)ERROR_CLUSTER_GROUP_MOVING(1254)
FAQ
Q: What does the ERROR_CLUSTER_SINGLETON_RESOURCE error mean?
A: This error indicates that a resource type is configured as a singleton within the cluster, and multiple instances of this resource are being attempted.
Q: How can I resolve this error?
A: Ensure that only one instance of the specified resource type exists in the cluster. Review and correct any conflicting operations or configurations.
Summary
The ERROR_CLUSTER_SINGLETON_RESOURCE error signifies a configuration conflict within a Windows Failover Cluster, where multiple instances of a designated singleton resource are being attempted. Developers should ensure proper resource management and adherence to cluster configuration rules to avoid this error.