https://docs.microsoft.com/en-us/answers/topics/windows-server.html

Takami Chiro 251 Reputation points
2021-10-04T15:08:39.36+00:00

HI everyone,

Good morning! Hope you can help, I already performed this twice. Here is what I encountered.

On the old file server running windows 2012, the current occupied size on the data drive is 3.5tb. No compression there. Then I used robocopy to transfer the data to a 6tb drive on a new file server running 2022. After 4 days, the 6tb drive on the new server is packed! I thought the first I may not do the robocopy command correctly. So I started over the process by deleting anything on the new server, but the outcome is still the same.

May I ask what happened? The 3.5tb on the old server will become 6tb? What should I check?

Thank you for your help.

Takami Chiro

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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  1. Dave Patrick 426.1K Reputation points MVP
    2021-10-04T15:12:31.147+00:00

    Might check the disk sector size.

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  2. Takami Chiro 251 Reputation points
    2021-10-04T15:39:23.607+00:00

    Hi DSPatrick,

    I think I know why. I found that the deduplication of the windows file server feature is enabled on the existing file server. So I just enabled and installed the same feature on the new file server and perform the data transfer again. I will see if that will preserve the same data size as the old server on the new server.

    Thank you for your response!

    Takami Chiro.

  3. Limitless Technology 39,381 Reputation points
    2021-10-06T18:21:40.21+00:00

    Hello @Takami Chiro

    You can check if Disk deduplication enabled or not on your data volume as per below powershell command example. 

    Get-DedupStatus -Volume "D:","F:"

    Also check if the volume is formatted with NTFS or ReFS file system.

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