Lessons learned from jointly using HTC- and HPC-driven e-Science infrastructures in fusion science

The interoperability of e-Science infrastructures like DEISA/PRACE and EGEE/EGI is an increasing demand for a wide variety of cross-Grid applications, but interoperability based on common open standards adopted by Grid middleware is only starting to emerge and is not broadly provided today. In earlier work, we have shown how refined open standards form a reference model, which is based on careful academic analysis of lessons learned obtained from production cross-Grid applications that require access to both, High Throughput Computing (HTC) resources as well as High Performance Computing (HPC) resources. This paper provides insights in several concepts of this reference model with a particular focus on the finding of using HPC and HTC resources with the fusion applications BIT1 and a cross-infrastructure workflow based on the HELENA and ILSA fusion applications. Based on lessons learned over years gained with production interoperability setups and experimental interoperability work between production Grids like EGEE, DEISA, and NorduGrid, we illustrate how open Grid standards (e.g. OGSA-BES, JSDL, GLUE2, etc) can be used to overcome several limitations of the production architecture of the EUFORIA framework paving the way to a more standards-based and thus more maintainable and efficient solution.