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?

cereberus said:

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?

For the iso it took me 18 seconds

Cliff S said:

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.

cereberus said:

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

Cliff S said:

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.

lx07 said:

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.

lx07 said:

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.

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



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