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The production xrootd cluster consists of a set of Solaris servers (wainNNN), Linux servers with a local files system (fermi-xrdNNN) and xrootd servers that access a GPFS file system. The current setup for the production xrootd use only one of the gpfs servers connecting directly to the redirector. As shown in the figure each fermi-gpfs server has access to the whole GPFS space so that all see the same files. In this case if all fermi-gpfs servers would connected to the redirector files on the GPFS file system would show up as multiple copies.
Gliffy Diagram
In order to handle the shared file system a subcluster was introduced in is currently used by the test xrootd.The subcluster redirector is aware that the xrootd data server export a shared file system. The setup is shown in the figure below. Clients still connect first the the main redirector (glast-test-rdr). If a file is on GPFS the client will be first redirected to the subcluster redirector which subsequently redirects it to one of the gpfs data server.
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