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Emergency Virtual Machine Online Migration in Cloud Data Centers

Service provided by virtual machine hosted at cloud data center (DC) has become the mainstream mode. However, cloud data centers are facing the threat from natural disasters. For disaster-affected data centers, to ensure the sustainability of services, virtual machine hosted at such data centers should be migrated quickly to safe data centers. This paper investigates an emergency virtual machine online migration scheme where the migration operation is carried out within the early warning of disaster. In the proposed scheme, a virtual machine can be migrated through multiple paths and the migration data center need to meet the required bandwidth and delay of connection requests supported by the virtual machine. An Integer Linear Program (ILP) model is established to get the solutions for the proposed scheme. The objective of the ILP model is to maximize the number of virtual machines successfully migrated within the given early warning time and the constraints are the available network resources. Numerical results show that the proposed model can effectively implement emergency virtual machine online migration.