Get as you Pay Model for IaaS Cloud Computing

Abstract

The IaaS cloud computing model is the foundation over which all other cloud computing services can be built. Thus, the migration from the traditional datacenter model to the cloud-computing model is highly dependent on the guarantees that the IaaS Cloud Provider can offer Cloud User to sustain service quality. These guarantees are expressed using Service Level Agreement (SLA) whose need to be aligned and tightly coupled with the cloud service lifecycle so as to reflect the financial and technical dynamicity of the SLA. However, we argue that the SLAs used at present are deficient in expressing solid guarantees on the service quality and lack the auto-negotiation feature required by cloud services. In that respect, SLAs used in practice do not fully abide by the "Pay as you Go" model for cloud computing. In this paper, we propose the "Get as you Pay" model that extends the "Pay as You Go" model by augmenting it with a descriptive SLA that supports the auto-scaling of resources. For validating the "Get as you Pay" model, we walk through a scenario to show how applying the model provides an expressive and negotiable SLA.