Windows error 5025 (ERROR_NOT_QUORUM_CLASS): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The selected resource is not from the shared-storage class required for this quorum mode.

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ERROR_RESOURCE_PROPERTIES_STORED	ERROR_CORE_RESOURCE

ERROR_NOT_QUORUM_CLASS

The resource class is incompatible with quorum-device use

This status is more specific than a generic resource failure. The cluster is rejecting the resource class for quorum use. In quorum designs that rely on a disk witness, the selected storage must satisfy cluster shared-storage requirements; a local or unrelated resource cannot substitute for it.

Do not change a resource type name or registry data to bypass the check. Quorum relies on supported arbitration and access behavior, so the remedy is to select a valid witness configuration for the cluster topology.

What to inspect

Inspect the current quorum mode and determine whether the intended design should use disk, file share, or cloud witness.
For shared storage, run cluster validation and confirm visibility from the required nodes.
Use the supported quorum configuration tools to select the witness; do not repurpose an application disk without validating its role and storage design.

Get-ClusterQuorum

References

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