Irods, for Integrated Rule-Oriented Data System, is a tool for accessing data distributed on different sites and on heterogeneous supports (file system on disk, databases, tapes magnetic etc …). This access is transparent to the user. For more information on the practical use of the Irods Computing Center, you can view this article But here are more precise information concerning the use of the tool.
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In case of problems, please submit a ticket at CC-IN2P3 User Support.