Teracopy hashes mismatch copying files from Windows VM to shares

General Discussion
1

Hi.
I am getting glitches in videos when played back via various media applications. When I check the source file on my Windows VM it plays fine and when I copy it over to the Truenas share again often the glitches are gone.
I have been using the normal Windows Explorer file copy but I tried with Teracopy today and the hashes are mismatched when copying.

On another popular home NAS forum someone mentioned ACS Override enabled on the VM OR have cache drive enabled on the share may have caused this problem.

Does anyone have any tips for me to try?
Thanks
Paul

2

I’ve done some testing and the problem only lies with video files (MKV and MP4). I have copied 2GB ISO and many different size ZIP and EXE files and they all copy without error.

I changed the NIC from a VirtIO to Intel on the VM and that didn’t make a difference.

Any ideas why video files no matter the size have hash mismatches?

3

Can you rephrase your problem?

It’s a bit difficult to follow.

This implies that copying the files from the Windows VM to the TrueNAS share works fine. So there’s no issue?

Are you implying that everything works fine when you copy with Windows Explorer, but the problem only occurs with TeraCopy?

4

Hi Winnie

Files will complete copy on my Windows VM to TrueNAS shares using File Explorer and Teracopy but I have found that video files have video glitches after the copy. they do not have the video glitches when in the VM client.

I only introduced Teracopy as I wanted to see if there was any error checking I could do and it shows that some (but not all) files have has mismatches after copying. I’ve now found this applies to any large files video, zip or iso.

I have used certuil -hashfile on some of the files. If I use File Explorer or Teracopy on a file and it fails with hash mismatch then the MD5 are different.
This was the MD5 of a file on the VM client
48513eac785b0aee810aadea58a4bb89
This is the MD5 on the NAS share
e8ac189d25e82242cf1a7836c3fd4a3f

I have enabled SFTP on TrueNAS and uploaded with FileZilla and the file on the NAS now has a matching MD5
48513eac785b0aee810aadea58a4bb89

I have repeated this test with half a dozen files now and those that fail in Teracopy and have different MD5 are okay after I replace them using FileZilla via SFTP

I think there is something wrong with my SMB share/service

6

If indeed the common denominator is Windows Explorer, and you’re absolutely sure that no other file transfer protocols have this issue, then share your SMB / SMB Share settings.

You’ve already ruled out other clients? You’ve tried this over CIFS (“Samba”) on Linux?

8

I think I have found the culprit! A VPN client installed on the Windows VM. I’ve excluded all apps from it except the internet ones I want and now lots of files have copied without hash mismatches.

Ahem!

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