I. Introduction
The eXtreme DataCloud (XDC) project [1] develops scalable technologies for federating storage resources and managing data in distributed infrastructures. The targeted platforms for the released products are the already existing and the next generation e-Infrastructures deployed in Europe, such as the European Open Science Cloud (EOSC), the European Grid Infrastructure (EGI), the Worldwide LHC Computing Grid (WLCG) and the computing infrastructures that will be funded by the H2020 EINFRA-12 call [1]. XDC is funded by the H2020 EINFRA-21-2017 Research and Innovation action under the topic “Platform-driven eInfrastructure innovation”, Subtopic 2 “Computing eInfrastructure with extreme large datasets” [3]. The XDC Consortium is composed by technology providers with a proven long-standing experience in software development and large research communities belonging to diverse disciplines: Life Science, Biodiversity, Clinical Research, Astrophysics, High Energy Physics and Photon Science. The consortium partners are: i) the Italian Institute for Nuclear Physics (INFN, IT) which leads the project, ii) the University of Cantabria (UC, Spain), iii) The Stiftung Deutsches Elektronen-Synchrotron (DESY, DE) laboratory, iv) the European Organization for Nuclear Research (CERN, CH), v) the Centre National de la Recherche Scientifique (CNRS, FR) vi) Akademia Gomiczo-Hutnicza Im. Stanislawa Staszica W Krakowie (AGH-UST, PL), vii) the European Clinical Research Infrastructure Network (ECRIN, FR), viii) the EGI Foundation (NL). XDC started on 1st November 2017 and will run for 27 months until January 2020. The EU contribution for the project is 3.07 million euros.