AVSS: An Adaptable Virtual Storage System

This paper presents the design and implementation of the Adaptable Virtual Storage System (AVSS) and introduces the capacity virtualization and performance virtualization for storage systems. AVSS has the following characteristics: 1) adoption of extended YFQ algorithm to control the allocation of bandwidth resources, realization of the performance isolation and guarantees of virtual disks; 2) adoption of hierarchy structure and dynamic mapping mechanism to manage heterogeneous storage resources flexibly and effectively, which lays a foundation for allocating storage resources on demand; 3) application of data-access frequency statistics and dynamic behavior analysis to supervise storage layout reorganization. The experimental results proved the correctness of our design. AVSS can isolate different applications and avoid performance interference. It can adjust storage layout according to the behavior of applications and improve the utilization of storage resources while improving the performance of the storage system.