Virtualization is an essential enabling technology for building and controlling computing frameworks that can dynamically adapt available physical resources to transient tasks such as the temporary creation of a virtual computing center tailored to the needs of a virtual organization. In this paper we will report on our strategy for the creation of virtual computer clusters based on standard Service-Oriented Architecture (SOA) and hosts virtualization technologies. We will describe our infrastructure designed for dynamical allocation of resources to applications via a general control plane based on workflows of coordinated web services. The control plane is based on logically independent services that are responsible for physical resource management and virtual nodes deployment. The control plane is also responsible for operations on virtual clusters such as their creation, startup and control.
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