Hi Andrew, Could xrdcp overwrite a file which already exists? Because now "xrdcp -f " will create a new file if the file already exists. It caused a lot of problem for us. Because some of us used "xrdcp -f" to rerun failed jobs, it created more than one replication for some files(one good file and the others are bad files). When reading these files, xrootd randomly select one replication to read. The result is that many bad files are read. So could xrdcp have an option to overwrite the old file instead of creating a new replication? Thanks Wen