IaaS Cloud Model for e-Ordering and e-Invoicing

This paper addresses the modeling of an IaaS cloud e-Ordering and e-Invoicing solution. We have faced several challenges in the process of migration of the existing web application on the cloud, such as the reorganization of the proposed noncloud model and the definition of the software modules that can communicate in a dynamic environment with various number of virtual machines. In the design process we have classified two kinds of software modules: static and dynamic. The classification is based on the level of required elasticity and scalability, as well as the activity that is associated with the corresponding module (tool). To finalize implementation of this idea, we have developed indicators to determine the required conditions for activation of additional cloud resources, or deactivation of involved resources. The result of this design process is a new cost effective solution with increased availability and performance compared to the non-cloud model. We have also recognized the advantages and disadvantages of such cloud solution, and discussed the characteristics that make our approach unique.