Robocopy Error #112 when copying large amount of data to EMC cifs

A customer had problems synchronizing large amount of data to an EMC CIFS share using the robocopy /mir commandline option.

After some troubleshooting I found that opslock, hidden sharing and CIFS caching were not the problem but the fact that the share was thin created. I created 2 shares, one thin and one fat. You guessed it right, the thin version failed. Changed the properties to fat and the problem was gone!