Toward optimal virtual machine placement and rejuvenation scheduling in a virtualized data center

Virtualization enables data centers to consolidate servers to improve resource utilization and power consumption. This paper presents the issues of performability management in a virtualized data center that hosts multiple services using virtualization. One of main cause of performability degradation is software aging in both virtual machines (VMs) and virtual machine monitor (VMM) in Virtualized Data Center (VDC). Software rejuvenation is a cost effective and a proactive method to counteract software aging. During software rejuvenation operations, there occurs down time, therefore, VM placement and the rejuvenation schedules for VMs and VMM need to be optimized so as to maximize the performability in a VDC. We introduce the state of the art technology on software aging and rejuvenation in virtualized data center and we formulate this problem and show our approach.