may i know remove offline disk 10GB and 6tb duplicate in win 2025 std core failover cluster condition

Hi Jayden Tan,

The duplicate offline disks (10 GB and 6 TB) you’re seeing are usually leftover LUNs or remnants from the Dell storage configuration. To clean this up safely, you can check using Disk Management or PowerShell which disks are actually in use by the cluster or CSVs. Then you can mark the unused disks as offline or remove them. Just be careful not to remove any disk that is hosting data, as that could cause data loss. Once confirmed, the system should stop showing the duplicate offline entries.

Thanks and hope it is usefull.

Hi Jayden,

Thanks for your update.
Here's a detailed guide to help you safely identify and remove them:

Step-by-Step Instructions (PowerShell)

1.List all disks and check their status

Get-Disk | Format-Table Number, FriendlyName, OperationalStatus, Size

→ Identify disks that are Offline and match the sizes 10 GB or 6 TB.

2.Check which volumes are in use

Get-Volume | Format-Table DriveLetter, FileSystemLabel, Size, FileSystem

→ Confirm which volumes are actively used (e.g., Q: drive or CSVFS_NTFS).

3.Check cluster usage

Get-ClusterSharedVolume
Get-ClusterResource | Where-Object {$_.ResourceType -eq "Physical Disk"}

→ Make sure the disk is not part of the cluster or used by Hyper-V.

4.Offline unused disks

Only do this if you're sure the disk is not in use:

Set-Disk -Number <DiskNumber> -IsOffline $true

Replace <DiskNumber> with the actual disk number you want to offline.

5.Remove disk from cluster (if applicable)

Remove-ClusterDisk -Name "<DiskName>"

→ Only use this if the disk was added to the cluster but is no longer needed.
Important Notes

Do not remove or offline any disk that is hosting active data or part of the cluster.

If you find this information useful to some extent, please accept the answer so that your experience with the issue would help contribute to the whole community. Thank you :)
Best regards,
Titus Bui