Abstract
Cloud computing is an emerging technology in the IT world. Some features of cloud, such as low cost, scalability, robustness and availability are attracting large-scale industries as well as small businesses towards cloud. A virtual machine (VM) is a software that can run its own operating system and applications just like an operating system on a physical computer. As the number of users increases, allocation of resources and scheduling become a complex task in a cloud. In a federated cloud environment when resource requirements of user requests exceed resource limits of cloud provider, to fulfil the requests the cloud provider can out-source to other cloud providers' resources. Under these circumstances it is desirable to minimize the Service Level Agreement (SLA) violations. This can be achieved through load balancing. This paper proposes a load balancing algorithm that is threshold based. We consider two types of pricing models for VMs, on-demand and reserved. Simulation results show that the proposed algorithm reduces the SLA violations.
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