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HERO vs. Zombie: Identifying Zombie Guests in a Virtual Machine Environment

Virtual servers are important in many data-centers. Multiple guest virtual machines are consolidated on several hosts on-site or on the cloud, and serve the organization’s computational needs. However, virtual machines not cleared from the system, known as zombie machines, waste resources and pose a security risk. We present a novel tool to optimize resource use by tracking down zombie machines: HERO (Host Environment Resource Optimization). HERO leverages multiple testing approaches and machine learning to assist system administrators in locating “zombie” machines.