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To allow for scaling, many hdf5 files are of small user-defined data (described above in Example Script Producing Small HDF5 File) can be written, one per "SRV" node.  The total number of SRV nodes is defined by the environment variable PS_SRV_NODES (defaults to 0).  These many hdf5 files are joined by psana into what appears to be one file using the hdf5 "virtual dataset" feature.

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