University of Gdansk
Cloud computing has become mainstream technology offering metallization of IT infrastructures as services along several paths such as Software (SaaS), Platform (PaaS), and Infrastructure (IaaS). Companies such as Amazon, Microsoft, IBM, and Google, to name but a few, offer such services, which rely on virtualization and pay-as-you-go business models. There are several issues that are likely to emerge in this context. Among them is the question of multi-tenancy and the control over where the processes actually run and where the data reside. While this might not appear to be a major issue for many users at first sight, the authors see several reasons to actually challenge this point.