Consuming Resources and Services from Multiple Clouds From Terminology to Cloudware Support

The consumption of resources and services from multiple Clouds for reasons like high availability, cost reductions or special features is a natural evolution from in-silo Clouds. Several middleware are already available for multiple Clouds. However, due to the complexity of the technical solutions, their approaches are quite different and a classification is needed to guide the potential users. This paper looks to the reports on multiple Cloud topics and proposes a specific taxonomy. It identifies the ready-to-use software and services and classifies them according the taxonomy. It also underlines the driving needs and requirements from consumers' and providers' point of views. A particular Cloudware is provided as an example for the degree of requirements fulfillment.