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Hi, During some tests (on 5.3.0 and in 4.X) I noticed that for some very small files (4 bytes, all zero valued bytes), the checksums fail in TPC (with root://). The checksum of the file is 00040001. Looking at the logs, in non TPC mode: xrdcp -f -d3 testfile_4B -C adler32:00040001 root://ceph-gw1.gridpp.rl.ac.uk:1094//dteam:test/jwalder/checksum_test ... [2021-07-16 10:54:16.395552 +0100][Dump ][Utility ] Checksum for /dteam:test/jwalder/checksum_test checksum: adler32:40001 [2021-07-16 10:54:16.395586 +0100][Info ][Utility ] Checksum verification: succeeded. ... It can be seen that the preceding "000" is not printed (although the stored checksum is correct). In the non-TPC mode the verification is successful. In TPC mode: xrdcp -f -d3 --tpc delegate only -C adler32:00040001 root://golias100.farm.particle.cz:1094//dpm/farm.particle.cz/home/dteam/test/jwalder_ckstest root://ceph-gw8.gridpp.rl.ac.uk:1094//dteam:test/jwalder/checksum_test [2021-07-16 10:58:47.215790 +0100][Dump ][Utility ] Checksum for /dteam:test/jwalder/checksum_test checksum: adler32:40001 Run: [ERROR] CheckSum error This time there is a mismatch - I'm assuming because of the dropped 000 ? Again, the stored checksum is still correct. In the last case, if the checksum is requested, but the source not provided, then it works again: xrdcp -f -d3 --tpc delegate only -C adler32 root://golias100.farm.particle.cz:1094//dpm/farm.particle.cz/home/dteam/test/jwalder_ckstest root://ceph-gw1.gridpp.rl.ac.uk:1094//dteam:test/jwalder/checksum_test [2021-07-16 11:09:50.834772 +0100][Dump ][Utility ] Checksum for /dteam:test/jwalder/checksum_test checksum: adler32:40001 [2021-07-16 11:09:50.834798 +0100][Info ][Utility ] Checksum verification: succeeded. I'm not sure where in the code to start looking though, but have (hopefully) attached the test file. [testfile_4B.txt](https://github.com/xrootd/xrootd/files/6829843/testfile_4B.txt) I'm sure this is a rather pathological case, but hopefully useful to report. Thanks, James -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1483 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1