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Hello Fabrizio I am transferring local files to xrootd using xrdcp. If two clients write to the same file in xrootd (at the same time) they succeed and the file in xrootd is a mixture of the two local files. I guess that this behavior is due to the use of kXR_force in the open call. In this case all file usage rules are ignored (from the xrootd Protocol manual) and many clients can open the same file (and step on each other's toes). Is this needed at all or could one use kXR_delete to overwrite a file? Cheers, Wilko