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A Novel Approach to Manage A Hybrid Storage System

Xiaojian Wu and A. L. Narasimha Reddy
Department of Electrical & Computer Engineering, Texas A&M University, USA

Abstract— This paper considers the problem of how to im¬prove the performance of hybrid storage system employing solid state disks and hard disk drives.We utilize both initial block allocation as well as migration to reach “Wardrop equilibrium”, in which the response times of different devices equalize.We show that sucha policy allows adaptive load balancing across devices of different performance. We also show that such a policy exploits parallelism in the storage system effectively to improve throughput and latency simultaneously. We implemented a prototype in Linux and evaluated it in multiple workloads and multiple configurations. The results show that the proposed approach improved both the latency of requests and the throughput significantly, and it adapted to different configurations of the system under different workloads.

Index Terms— SSD, Storage, Hybrid storage

Cite:Xiaojian Wu and  A. L. Narasimha Reddy, "A Novel Approach to Manage A Hybrid Storage System," Journal of Communications, vol. 7, no.7, pp.473-483, 2012. Doi: 10.4304/jcm.7.7.473-483