One of the major feature of Cloud Computing is its elasticity, thus allowing one to have a moving infrastructure at a lower cost. Achieving this elasticity is the job of the cloud provider, whether it is IaaS, PaaS or SaaS. On the other hand, Single System Image has a hotplug capability. It allows to "transparently" dispatch, from a user perspective, the workload on the whole cluster. In this paper, we study whether and how we could build a Cloud infrastructure, leveraging tools from the SSI field. Our goal is to provide, thanks to Kerrighed for the computing power aggregation and unified system view, some IaaS and to exploit XtreemFS capabilities to provide performant and resilient storage for the associated Cloud infrastructure.