Hi Tim, >Does xrootd need the accurate file size? Not at all. At best a ball-park figure will do. Even a large enough constant will do as well. > The mapping onto other "ls -l" fields (eg. file mode) is also rudimentary, > and directories probably aren't supported at all. Anything will do for these fields, as long as it's syntactically valid and semantically consistent. > This is presumably a problem for any MSS without a full metadata catalogue. Yes, but we really don't care about what the real values are most of the time. Andy