Is there any way to check if a (UNC path) volume is a Windows DedupVolume or not?

Naveen Kedilaya 6

I wanted to find out if a given volume has Data Deduplication enabled or not.

For a local volume this is straightforward using the WMI query:

select * from MSFT_DedupVolume where Volume='E:\\MountFolder\\DedupVolume'

But for a UNC path as volume name, the WMI query returns nothing (no error, just blank output).

select * from MSFT_DedupVolume where Volume='\\\\windowsMachine\\E$\\MountFolder\\DedupVolume'

In wmi-access-to-unc-paths it is mentioned that

WMI operations are not allowed to access network resources due to security restrictions in Windows.

Is there any other way to find out if a UNC path volume has Data Deduplication configured or not?

Junjie Zhu - MSFT 17,311 Reputation points Microsoft Vendor

2022-04-07T01:33:40.717+00:00

Have you tried psexec. https://learn.microsoft.com/en-us/sysinternals/downloads/psexec
Naveen Kedilaya 6 Reputation points

2022-04-07T05:35:27.097+00:00
Thanks for the suggestion. When I was writing a powershell script to run on remote machine using psexec, I found out that it was possible to get the information directly by powershell as I already knew the computer name (windowsMachine) and the volume name (E:\MountFolder\DedupVolume) using this command:

Get-WmiObject -Query "select * from MSFT_DedupVolume where Volume='E:\\MountFolder\\DedupVolume'" -Namespace 'root/microsoft/windows/deduplication' -ComputerName 'windowsMachine'
Junjie Zhu - MSFT 17,311 Reputation points Microsoft Vendor

2022-04-07T05:41:04.797+00:00

So you found a way to make it work. Have you solved your problem completely?
Naveen Kedilaya 6 Reputation points

2022-04-07T05:43:28.773+00:00

Yes the problem is solved. I am able to get the DedupVolume information for the volume on the remote machine using the above query I mentioned. Thanks.

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