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QDR: a QoS-aware data replication algorithm for Data Grids considering security factors

机译:QDR:考虑安全因素的用于数据网格的QoS感知数据复制算法

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摘要

Data Grid integrates geographically distributed resources for solving data sensitive scientific applications. Dynamic data replication algorithms are becoming increasingly valuable in solving large-scale, realistic, difficult problems, and selecting replica with multiple selection criteria-availability, security and time- is one of these problems. The current algorithms do not offer balanced QoS levels and the mechanism of rating QoS parameters. In this paper, we propose a new replica selection strategy, which based on response time and security. However, replication should be used wisely because the storage size of each Data Grid site is limited. Thus, the site must keep only the important replicas. We also present a new replica replacement strategy based on the availability of the file, the last time the replica was requested, number of access, and size of replica. We evaluate our algorithm using the OptorSim simulator and find that it offers better performance in comparison with other algorithms in terms of mean job execution time, effective network usage, SE usage, replication frequency, and hit ratio.
机译:数据网格集成了地理上分散的资源,用于解决对数据敏感的科学应用。动态数据复制算法在解决大规模,现实,困难的问题方面正变得越来越有价值,而选择具有多个选择标准(可用性,安全性和时间)的副本是这些问题之一。当前的算法不提供平衡的QoS级别和评级QoS参数的机制。在本文中,我们提出了一种基于响应时间和安全性的新副本选择策略。但是,应该明智地使用复制,因为每个Data Grid站点的存储大小是有限的。因此,该站点必须仅保留重要的副本。我们还根据文件的可用性,上次请求副本的时间,访问次数和副本的大小,提出了一种新的副本替换策略。我们使用OptorSim模拟器评估了我们的算法,发现在平均作业执行时间,有效网络使用率,SE使用率,复制频率和命中率方面,与其他算法相比,它提供了更好的性能。

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