A transnational data system for HPC/Cloud- Computing Workflows based on iRODS/EUDAT

In this contribution, we present a transnational iRODS federation as a backend for distributed computational/Big Data workflows from science and industry. This system, the "LEXIS Distributed Data Infrastructure (DDI)", has been built in the project "Large-Scale EXecution for Industry and Society" (LEXIS, H 2020 GA 825532). It makes use of EUDAT B2SAFE, B2HANDLE, and B2STAGE on top of iRODS, to support a variety of use cases, starting with the three LEXIS Pilots: Simulations in Aeronautics Engineering, Earthquake/Tsunami Analysis, and Weather and Climate Prediction. Our presentation covers different aspects of setting up this system, from system to highlevel concepts. We layout our experience in setting up a version of HAIRS (High-Availability iRODS System, cf. contributions of Kawai et al. to this meeting series), where we adapted the concept, and of installing EUDAT modules on top of it to provide the functionalities required within LEXIS. Afterward, we lay out our approach to integrating the iRODS system with the LEXIS platform, based on providing REST APIs to control and address the data system. These REST APIs are mostly custom LEXIS developments, based on conventional programming interfaces (e.g. python client) available for iRODS. Finally, we give a short status and outlook on the application of the system, and further aspects of our project interesting for the iRODS community (e.g., authentication via OpenID Connect with adaptation to Keycloak, collection structure of the iRODS system and backend systems, as also described in LEXIS publications).