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ERROR_QUORUM_NOT_ALLOWED_IN_THIS_GROUP
A quorum witness is not an ordinary available-storage resource
ERROR_QUORUM_NOT_ALLOWED_IN_THIS_GROUP means an operation attempted to place the quorum resource in the Available Storage group. A disk or file-share witness participates in cluster membership decisions and is managed as a core cluster resource; Available Storage is the holding group for disks not yet assigned to a clustered role.
Inspect the current quorum model with Get-ClusterQuorum before moving or repurposing storage. Configure the witness through quorum-specific tools rather than generic resource-group movement. A CSV also cannot serve as a quorum witness. If the underlying disk is being replaced, change the quorum configuration first, verify that the cluster retains sufficient votes, and only then return the old disk to available storage.
Quorum-specific checks
- Current quorum mode and witness resource.
- Group that owns the proposed witness.
- Node and witness votes before and after the change.
- Whether the storage is a CSV or already assigned to another role.
References
- Microsoft: quorum witness and voting behavior
- Microsoft: configuring the cluster quorum
- Microsoft: CSV restrictions, including witness use
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