网络RAID存储系统边界性能研究

Research on Performance Bounds of Networked RAID Storage Systems

目前针对网络存储系统性能的研究大都集中在定性研究方面,缺乏有效的定量分析方法和模型.在有限容量闭合排队网络理论的基础上,提出了网络RAID存储系统性能的定量分析模型.并提出了一种新的计算有限容量闭合排队网络系统边界性能的分析方法APBA法,和其他近似分析方法相比,APBA法的计算时间复杂度更低.测试结果表明,通过利用APBA方法,由网络RAID存储系统的性能定量分析模型获得的系统性能值,可以有效反映网络RAID存储系统在轻载区、重载区和过载区的性能边界,以及系统的最大负载量.

Previous work on performance evaluation of networked storage systems has been mostly qualitative, and the quantitative analytical method and model are still limited. A quantitative analytical model based on CQN-FC (closed queueing networks with finite capacity) is presented according to the data flow of distributed networked software RAID (dns-RAID). In order to cope with the state space explosion problem of CQN-FC solution, a novel approximate performance bounds analysis (APBA) method is proposed, which has lower computational complexity than other approximate analytical methods in the literature. Experimental testing results show that, the performance bounds of dns-RAID based on CQN-FC calculated by APBA method can reflect the actual throughput and I?O response time bounds in light load, heavy load and over load respectively, and can offer the maximal system load as well.