Copying files from Win7 Pro to DFS share
Hi, I am having an issue with Win7 Pro writing files to a Win2k3 R2 DFS share, I can copy tiny files (around 200k in size) however when I try to write a large file (4gb file) I receive the following error: " Error 0x8007003B: An unexpected network error occurred. " I then tried writing the file directly on the DFS share with \\servername\share however I still received the error, after this I created a brand new share on my file server outside of DFS to which the file was copied successfully, I can also write the file to C$ share. So to summarise, large files cannot be copied to any DFS share on my network but can be copied to shares that are not part of DFS. **Update** Just tried the same test on a completely different system to which the same issue is occurring (this system has had no patches install, no software just registered to the domain).
December 10th, 2009 1:19pm

I suggest that we try to disable the auto-turning function first. 1. Click Start, click All Programs, and then click Accessories.2. Right-click Command Prompt, and then click Run as Administrator.3. At the command prompt, type the following command, and then press ENTER: netsh interface tcp set global autotuninglevel=disabled 4. Exit the Command Prompt window.5. Restart the computer. If it does not help, I suggest you read the following article. Slow Large File Copy Issues As we can see the file system cache may be overhead when we copy large files. When copying to a NTFS we may not receive error message and just encounter performance issues. Can you adjust the caching size for the DFS? If not you may just disable read and write caching for the DFS.Arthur Xie - MSFT
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December 16th, 2009 11:09am

Hi, Sorry for the delay in trying this, mixture of holidays and snow! I ran the command you advised which resulted in a Ok being produced, I restarted the system however the problem still persists.
January 11th, 2010 5:35pm

Another update, received a new system that came prebuilt by an OEM and the system is exhibiting the same issue as described above. However I've noticed that I can write to DFS shares that are not replicated without any issue so it seems this is related to DFS-R only. Anyone else experienced this?
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January 28th, 2010 5:21pm

I am getting the same error with a similar operation: copies to a duplication enabled default share folders in a clean WHS with Power Pack 3, but file size doesn't seem to matter. I had a few failed backups, checked the details and was getting read/write errors on drive D, so I copied all my shares (photos, videos, etc.) to another system on the LAN, replaced that physical drive, added and formatted a few additional drives (not the suspect one), reinstalled WHS and applied all the patches and updates, turned on duplication for all shared folders, configured my users, connected two clients and configured their backups, then tried to restore my backed up shares to the new server. I kicked off copies folder by folder, so I had about 5 separate long copy operations running from my Win7-64 client to my WinHomeServer, and left it running overnight. I have a gigabit LAN, so the bottleneck was disk speed. The client was set to not enter sleep/suspend/hibernate, only screensaver. When I woke up this morning, some were done, but three copy groups were stuck on retry/skip/cancel dialogs. Retried several times with no difference. Tried to access those folders through Explorer and they were visible. Retried a few more times and one continued but two gave me "An unexpected network error occurred." with "Error 0x8007003B". Retried and checked the box to do this for all instances, and eventually all went through and continued copying. I went and checked and the files that it had been stuck on were copied successfully to the server eventually, but instead of finishing the copy overnight, I still have a few hours to go. File sizes: one was a 2.4GB file, the others were just a 4.6MB JPG and a 25MB WMA file.
July 17th, 2010 6:39pm

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