Cluster disk quorum not showing in Cluster Core Resources

[Mike Leone]

This is odd. I have a Win 2019 cluster, it uses a disk witness. I set the quorum settings to use said disk. In "Storage" I see that disk assigned to "Disk Witness in Quorum".

But in "Cluster Core Resources" when I select the cluster name ... I see the cluster name and IP, but I do NOT see the disk witness. And I don't know why ... I went through the cluster quorum settings again, chose a disk witness, choose the disk I want, it said fine ... no changes.

Yet it's not shown in the Core Resources, and so it's failing validation (and it must have passed validation in the past, or I wouldn't have been able to create the cluster.

What I need is to add a new node to the cluster, so I can evict one of the current nodes.

PS C:\Windows\system32> Get-ClusterQuorum | fl *


Cluster        : PHAMSCLUST32
QuorumResource : Q: [Quorum] (Cluster Disk 1)
QuorumType     : Majority

I mean, that *looks* right, for a disk witness. But why isn't it shown in the Core Resources? The Validation Report is saying that there is a disk witness, but it's being used as a data disk.

Failover Cluster Validation Report

Validate Quorum Configuration

Description: Validate that the current quorum configuration is optimal for the cluster.
Start: 8/4/2025 4:03:37 PM.
Validating cluster quorum settings.
Witness Type: Disk Witness
Witness Resource: Q: [Quorum] (Cluster Disk 1)
Cluster managed voting: Enabled
The disk witness in the cluster is used as a data disk. This is not recommended.

Voter Name	State	Assigned Vote	Current Vote
Q: [Quorum] (Cluster Disk 1)	Online	1	1
DC1FIL012	Up	1	1
DC1FIL013	Up	1	1

Any ideas?

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[Mike Leone]

I managed to resolve it by (temporarily) creating a File Share Witness. Once I did that, I was able to validate the cluster. And then I could add my new node.

Since I'll be creating a brand new cluster to replace this, and copying the data over, this is Good Enough for now ...

Thanks

[Philip Elder]

Is there anything else on that disk witness other than the cluster metadata?

 

That’s how I read the warning in the validation output.

 

Philip Elder MCTS

Senior Technical Architect

Microsoft High Availability MVP

MPECS Inc.

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[Mike Leone]

Nothing that I can see

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