A Response Time Distribution Model for Zoned RAID
A Response Time Distribution Model for Zoned RAID
复制标题
分区RAID响应时间分布模型
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
W. Knottenbelt
中科院分区：
文献类型：
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作者：
Abigail S. Lebrecht;N. Dingle;W. Knottenbelt
RAID系统被广泛部署，既作为独立的存储解决方案，也作为现代虚拟化存储平台的构建块。因此，RAID系统性能的准确模型对于理解存储系统性能至关重要。为此，本文提出了一种基于网络的RAID系统的共享模型，该模型由分区磁盘组成，并在RAID 0-1或5级运行。对以前工作的贡献是双重的。首先，我们的分析近似完整的I/O请求响应时间分布，而不仅仅是平均值。这提供了推理响应时间分位数和响应时间的高阶矩的能力-这两者在现代服务质量需求的上下文中都很有用。其次，我们验证我们的模型对测量从一个真实的RAID系统，而不是一个软件模拟。预测和观察到的响应时间分布之间的密切协议，我们的模型的有效性提供了很高的信心。
RAID systems are widely deployed, both as standalone storage solutions and as the building blocks of modern virtualised storage platforms. An accurate model of RAID system performance is therefore critical to understanding storage system performance. To this end, this paper presents a queueing network-based model of RAID systems comprised of zoned disks and operating at RAID level 0-1 or 5. The contribution over previous work is twofold. Firstly, our analysis approximates full I/O request response time distributions rather than just mean values. This provides the ability to reason about response time quantiles and higher moments of response time --- both of which are useful in the context of modern quality of service requirements. Secondly, we validate our model against measurements from a real RAID system rather than a software simulation. The close agreement between predicted and observed response time distributions gives a high level of confidence in the validity of our model.