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Hi, Andy In the context of proof I had already thought of whether one could use the olbd to just ask about file locations without really accessing the files. The information would then be used to direct jobs to nodes which already have the required file. (I.e. in this picture, every worker node runs an xrootd/olbd). Is it possible to do a bulk lookup of many files on the olbd? If this can be done in bulk mode, then I guess you would still need only the basic waiting time (~5 s default delay) until you know where the files are. This kind of information could be interesting for all kinds of job scheduling/queuing systems. (PS: Andreas is on a meeting and I still have no feedback on the issue concerning the "opaque information" problem and our athorization extension). Cheers, Derek -- Dr. Derek Feichtinger Tel: +41 22 767 10 07 LCG/ARDA Group email: [log in to unmask] CERN http://people.web.psi.ch/feichtinger CH-1211 Genève 23