Distributed storage on networks of Linux PCs using the iSCSI protocol

2008 International Conference on High Performance Switching and Routing Pub Date : 2008-05-15 DOI:10.1109/HSPR.2008.4734452

A. Bianco, J. Finochietto, Marco Modesti, F. Neri

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引用次数: 7

Abstract

iSCSI is a protocol standardized by IETF that runs on a TCP/IP network to transfer standard SCSI commands. In this paper, we evaluate the performance of iSCSI using standard PCs running a software implementation of the protocol, with the aim of assessing the performance of low-cost distributed storage solutions. First, we compare the performance when using a local disk with those of a virtualized disk connected through a standard gigabit Ethernet LAN during file I/O operations. Then, we emulate the characteristics of a WAN/MAN setup by using a software emulator within the Linux kernel to generate delays and packet losses, and evaluate the ability of iSCSI to offer disaster recovery solutions over high-speed long-distance links. We found that, even if TCP can be tuned to support links with large bandwidth-delay products, iSCSI does not reach good performance due to its windowing scheme that is not large enough, in the used software implementation, to support long-distance links. Finally, we test the iSCSI behavior when other types of traffic share network links with the iSCSI protocol.

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使用iSCSI协议在Linux pc的网络上进行分布式存储

iSCSI是由IETF标准化的协议，它运行在TCP/IP网络上，用于传输标准SCSI命令。在本文中，我们使用运行该协议的软件实现的标准pc来评估iSCSI的性能，目的是评估低成本分布式存储解决方案的性能。首先，我们比较了在文件I/O操作期间使用本地磁盘与通过标准千兆以太网LAN连接的虚拟磁盘的性能。然后，我们通过使用Linux内核中的软件模拟器来模拟WAN/MAN设置的特性，以产生延迟和数据包丢失，并评估iSCSI在高速长途链路上提供灾难恢复解决方案的能力。我们发现，即使TCP可以调整为支持具有大带宽延迟产品的链路，iSCSI由于其窗口方案不够大，在使用的软件实现中，也无法达到良好的性能，以支持长距离链路。最后，我们测试了当其他类型的流量使用iSCSI协议共享网络链路时的iSCSI行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2008 International Conference on High Performance Switching and Routing

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