基于QoS的数据迁移模型的设计

结合对象存储的特点，提出基于QoS 的存储系统模型。该模型将迁移任务划分为细粒度的迁移请求，使对象存储设备在实现数据
迁移的同时能响应I/O 请求。元数据服务器按相同的标准给I/O 请求和迁移请求分配相应的收益，使对象存储设备能采用收益最大算法调
度I/O 请求和迁移请求，从而提供更高的服务质量。通过收益预测和带宽预留实现在线最大收益调度算法。实验表明，最大收益算法与通
常的迁移优先算法和固定平均迁移率算法相比，对系统的I/O 性能影响最小。
关键词：对象存储；服务质量；数据迁移；最大收益
Design on Data Migration Model Based on QoS
LUO Yi-hui1,2, XIE Chang-sheng2
(1. School of Mathematics and Computer Science, Hubei University, Wuhan 430062;
2. National Storage System Laboratory, School of Computer, Huazhong University of Science and Technology, Wuhan 430074)
【Abstract】A storage system model is given based on Quality of Service(QoS) according to the object storage characteristics. This model divides
the migration task into some migration requests, which makes object storage device respond I/O request as it migrates data from one site to others. At
the same time, the metadata server assigns the income to the I/O and the migration request according to the same criterion, which make the storage
devices respond the both request by the maximum income algorithm and provide the better QoS. The maximum income algorithm is online realized
by income forecasting and bandwidth obligating. Experiment proves that the maximum income algorithm has less infection to I/O performance than
the migration first algorithm and the fixed migration rate algorithm.
【Key words】object storage; Quality of Service(QoS); data migration; maximum income