Performance Evaluation of File Operations on OverlayFS

The amount of power consumed by servers has become an important problem. Server consolidation using virtualization is a promising solution. Docker, which is an emerging container-based virtualization, provides virtualization with a small overhead and utilizes OverlayFS, which is a union mount filesystem for Linux, for presenting a filesystem to each container. In this work, we focus on OverlayFS and evaluate its basic performance. Our evaluation demonstrates that some of its operations, such as checking both directories sometimes declines its performance.