Hi Andy, Thanks for the detailed reply. We will make ourselves familiar with the descriped mechanisms. There is just some question left about integrating SRM into the xrootd service. Did I understand correctly that "to integrate xrootd with a generalized SRM" means that instead of having oss/ofs and/or MPS you would prefer to talk SRM client protocol and with that have a general interface to mass storage systems (disk/tape) ? BTW: are there any plans to let xrootd talk the SRM server protocol so that it can serve as a Storage Element ? dCache Team