Hello, In PROOF, we want to use xrootd for uploading files to a proof cluster and calculating checksums is very desired. I found this (and only this) place mentioning checksum directive for xrootd: http://xrootd.slac.stanford.edu/examples/slacWrite/ and there is a mistake: The directive recognized by xrootd is xrootd.chksum not xrootd.cksum In fact, the directive's syntax is only described in code. Regards, Jan