![]() ![]() Besides considering common objectives of infrastructure providers (e.g., efficient usage of the physical substrate, cost minimization, increasing revenue), an allocation algorithm should consider the users' expectations (e.g., allocation quality, data location and mobility). In addition, mapping a set of VIs onto a distributed substrate is an NP-hard problem. The complete abstraction of physical resources, coupled with the indeterminism of required computing and communication resources to execute applications, turned the specification and composition of a VI into a challenging task. The innovation introduced by VIs posed a set of challenges requiring the development of new models, technologies, and procedures to assist the migration of existing applications from traditional infrastructures to VIs. By combining IT and network virtualization, the VI concept is turning the Internet into a worldwide reservoir of interconnected resources, where computational, storage, and communication services are available on-demand for different users and applications. Virtual Infrastructures (VIs) have emerged as result of the combined on-demand provisioning of IT resources and dynamic virtual networks. ![]()
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