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网络化存储通过引入网络的概念将存储独立于服务器甚至通信网络,已经成为传统存储方式的有力替代者.然而,FC-SAN虚拟存储方式的存储性能依赖于存储对象的某些属性,在某些情况下,其性能甚至不如传统的LAN数据共享方式.就FC-SAN虚拟存储方式中的数据放置和访问路径选择对这一问题进行了研究.首先通过分析虚拟存储原理提出了一个数据访问耗时的线性模型;然后,就数据放置和访问路径选择提出了一个决策方法;并在进一步探讨这一方法的过程中,定义了虚拟存储代价当量的概念,用以评价FC-SAN虚拟存储环境中的数据放置的代价,从而为评价以及如何选择数据放置和访问路径提供了一种定量的手段.最后,在数字图书馆的一个海量存储原型系统中对上述的理论分析、各种条件进行了实验验证,并结合实际给出了虚拟存储代价当量的计算方法,验证了所提出的方法的有效性.
Networked storage has become a powerful alternative to traditional storage methods by introducing the concept of network independent of servers and even communication networks.However, the storage performance of FC-SAN virtual storage depends on some attributes of storage objects, Case, its performance is not even as good as the traditional way of LAN data sharing.This problem has been studied in data storage and access path selection in FC-SAN virtual storage.Firstly, by analyzing the virtual storage principle, a data access time-consuming Then, a decision-making method is proposed for data placement and access path selection. In the process of further discussion of this method, the concept of virtual storage cost equivalence is defined to evaluate the FC-SAN virtual storage environment The price of data placement, which provides a quantitative method for evaluating and choosing data placement and access path.Finally, in a mass storage prototype system of digital library, the above theoretical analysis and various conditions are verified experimentally , And gives the calculation method of the equivalent cost of virtual storage combining with reality, verifying the proposed method Effectiveness.