Abstract
Helix Nebula - the Science Cloud Initiative - is a public-private partnership between Europe's leading scientific research organisations and European IT cloud providers. CERN contributed to this initiative by providing a flagship use case: the workloads from the ATLAS experiment. Aiming to gain experience in managing and monitoring large-scale deployments, as well as in benchmarking the cloud resources, a sizable Monte Carlo production was performed using the Helix Nebula platform. This contribution describes the Helix Nebula initiative and summarizes the experience and the lessons learned from deploying ATLAS experiment application within large cloud setups involving several commercial providers.
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