Roger Jones: The ATLAS Computing Model Ankara, Turkey - 2 May 2008 7 First Grid Deployments l In 2003-2004, the first Grid middleware suites were deployed on computing facilities available to HEP (LHC) experiments nNorduGrid (ARC) in Scandinavia and a few other countries nGrid3 (VDT) in the US nLCG (EDG) in most of Europe and elsewhere (Taiwan, Japan, Canada…) l The LHC experiments were immediately confronted with the multiplicity of m/w stacks to work with, and had to design their own interface layers on top of them nSome experiments (ALICE, LHCb) chose to build a thick layer that uses only the lower-level services of the Grid m/w nATLAS chose to build a thin layer that made maximal use of all provided Grid services (and provided for them where they were missing, e.g.
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