Very slow file transfer from hyper-v to host drive

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  1.    18 Mar 2017 #1

    Very slow file transfer from hyper-v to host drive


    I have my hard drives connected using enhanced mode options to a hyper-v vm (10 pro). I have always had issues with slow file transfer, and was pointed down route of setting up folders as network shares, and I got much faster file transfer times.

    However, I am trying to copy the uup folders and getting very low file speeds e.g 100 kb/s at times r less varying up and down wildly. I know there are thousands of files, so I guess this is having a massive overhead. Any ideas how I can speed this up?
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  2. Cliff S's Avatar
    Posts : 21,961
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       18 Mar 2017 #2

    cereberus said: View Post
    I have my hard drives connected using enhanced mode options to a hyper-v vm (10 pro). I have always had issues with slow file transfer, and was pointed down route of setting up folders as network shares, and I got much faster file transfer times.

    However, I am trying to copy the uup folders and getting very low file speeds e.g 100 kb/s at times r less varying up and down wildly. I know there are thousands of files, so I guess this is having a massive overhead. Any ideas how I can speed this up?
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      My ComputersSystem Spec

  3. Cliff S's Avatar
    Posts : 21,961
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       18 Mar 2017 #3

    Click image for larger version. 

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    For the iso it took me 18 seconds
      My ComputersSystem Spec

  4.    18 Mar 2017 #4

    Cliff S said: View Post
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    This is what I have been trying - just very slow on uups folders. I am sure issue is related to the vast number of files.
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  5. Cliff S's Avatar
    Posts : 21,961
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       18 Mar 2017 #5

    cereberus said: View Post
    This is what I have been trying - just very slow on uups folders. I am sure issue is related to the vast number of files.
    I don't create my own ISO, so I have no UUPS files to test with, sorry
      My ComputersSystem Spec

  6.    18 Mar 2017 #6

    Cliff S said: View Post
    I don't create my own ISO, so I have no UUPS files to test with, sorry
    Just copied a large iso - much faster but still slow - around 3 minutes.
      My ComputerSystem Spec

  7.    18 Mar 2017 #7

    Not a solution to slow copying but you could leave the UPPs where they are.

    Make a Temp VHDX (10GB or so), attach it to your VM and put the UPP conversion tool in there. You can point the tool at the directory containing the UPPs (in SoftwareDistribution or wherever) and it will make the ISO in the Temp VHDX.

    You can then shut down and detach the Temp VHDX. Then you can either mount it in the host or another VM to use the ISO.
      My ComputerSystem Spec

  8.    18 Mar 2017 #8

    lx07 said: View Post
    Not a solution to slow copying but you could leave the UPPs where they are.

    Make a Temp VHDX (10GB or so), attach it to your VM and put the UPP conversion tool in there. You can point the tool at the directory containing the UPPs (in SoftwareDistribution or wherever) and it will make the ISO in the Temp VHDX.

    You can then shut down and detach the Temp VHDX. Then you can either mount it in the host or another VM to use the ISO.
    Good idea - I will try that.
      My ComputerSystem Spec

  9.    19 Mar 2017 #9

    lx07 said: View Post
    Not a solution to slow copying but you could leave the UPPs where they are.

    Make a Temp VHDX (10GB or so), attach it to your VM and put the UPP conversion tool in there. You can point the tool at the directory containing the UPPs (in SoftwareDistribution or wherever) and it will make the ISO in the Temp VHDX.

    You can then shut down and detach the Temp VHDX. Then you can either mount it in the host or another VM to use the ISO.
    Actually. although slow, copying the iso is not that arduous. The key trick was to produce iso in hyper-v, not copy all the files to host. Takes longer to produce iso but that is less of an issue as I can leave hyper-v running in background.

    Cheers pal for a workaround.
      My ComputerSystem Spec

  10. Kari's Avatar
    Posts : 15,151
    Windows 10 Pro
       29 Mar 2017 #10

    This is still the fastest way to copy from Hyper-V vm to host:

    Click image for larger version. 

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    In elevated command prompt, assign drive ID for a host share and copy.
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