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Issue No. 06 - November/December (2011 vol. 8)
ISSN: 1545-5971
pp: 839-851
Kenichi Kourai , Kyushu Institute of Technology, Fukuoka
Shigeru Chiba , Tokyo Institute of Technology, Tokyo
As server consolidation using virtual machines (VMs) is carried out, software aging of virtual machine monitors (VMMs) is becoming critical. Since a VMM is fundamental software for running VMs, its performance degradation or crash failure affects all VMs running on top of it. To counteract such software aging, a proactive technique called software rejuvenation has been proposed. A simple example of rejuvenation is to reboot a VMM. However, simply rebooting a VMM is undesirable because that needs rebooting operating systems on all VMs. In this paper, we propose a new technique for fast rejuvenation of VMMs called the warm-VM reboot. The warm-VM reboot enables efficiently rebooting only a VMM by suspending and resuming VMs without saving the memory images to persistent storage. To achieve this, we have developed two mechanisms: on-memory suspend/resume of VMs and quick reload of a VMM. Compared with a normal reboot, the warm-VM reboot reduced the downtime by 74 percent at maximum. It also prevented the performance degradation due to cache misses after the reboot, which was 52 percent in case of a normal reboot. In a cluster environment, the warm-VM reboot achieved higher total throughput than the system using VM migration and a normal reboot.
Operating systems, checkpoint/restart, main memory, availability, performance.

K. Kourai and S. Chiba, "Fast Software Rejuvenation of Virtual Machine Monitors," in IEEE Transactions on Dependable and Secure Computing, vol. 8, no. , pp. 839-851, 2010.
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