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I want to create an xrootd configuration where I have three separate namespaces: one for file storage for a grid SRM, one for centralized storage and one for distributed storage on worker nodes. The later two do not necessarily need to be separate namespaces, but I do want to be able to control whether files are storage centrally or distributed on the worker nodes. The centralized storage, both SRM and general use, are physically located on same machine and either or both may be made up of several distinct filesystems. The main motivation for this configuration is to preserve flexibility. To some extend, I would rather have a single namespace, but I want to be able to absolutely reserve space on the SRM side, and that doesn't seem possible in the current software. Is it correct that I should run two data server xrootd processes, one to handle the SRM namespace and one to handle the central general use namespace? Is there any problem running the three namespaces through a single redirector? Is there anything special I should be aware of in trying to set this up? Thanks. Paul T. Keener Department of Physics and Astronomy University of Pennsylvania