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Hi, I've been messing around trying to get the stage queues in the mps system working here at RAL so we can limit the impact of switching on staging on the MSS by limiting the number of concurrent accesses (and have got it going more or less once I found out that the --basedir/mps.basedir option is completely ignored in the mps_PreStage code and fixed it) but I cannot work out how one is suppose to integrate it with the xrootd/olbd system. mps_prep seems to take completely different arguments to mps_stage so we cannot just drop that in as a replacement, more seriously it returns as soon as the file is placed in the stage queue not when the file is on disk. Do we need to write yet another wrapper script to translate the options and hold on until the file has appeared. The MPS documentation suggest that the olbd interacts directly with the stage queue but doesn't give any details. Yours, Chris. -- Chris Brew ([log in to unmask]) +44 1235 446326 Particle Physics Department Rutherford Appleton Laboratory Chilton, Didcot. Oxfordshire. OX11 0QX. United Kingdom.