DM-Cache를 이용해 구현한 SSD 캐시의 성능 평가

초록

The amount of data located in storage servers has dramatically increased with the growth in cloud and social networking services. Storage systems with very large capacities may suffer from poor reliability and long latency, problems which can be addressed by the useof a hybrid disk, in which mechanical and flash memory storage are combined. The Linux-based SSD(solid-state disk) uses a cachingtechnique based on the DM-cache utility. We assess the limitations of DM-cache by evaluating its performance in diverse environments,and identify problems with the caching policy that it operates in response to various commands. This policy is effective in reducinglatency when Linux is running in native mode; but when Linux is installed as a guest operating systems on a virtual machine, theoverhead incurred by caching actually reduces performance.

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