基于流媒体的网络磁盘阵列中的并行流水策略研究

针对流媒体数据 ,结合网络磁盘阵列的工作特点 ,提出了一种并行流水生产者消费者模型 .该模型采用并行技术 ,通过截断 SCSI命令的 I/ O周期来流水重叠系统中多个数据请求的磁盘 I/ O操作和 CPU计算 ,最大限度地提高了系统的并行性 .测试结果表明 ,采用该模型的网络磁盘阵列系统性能得到了很大的提高     

A cost effective fault-tolerant scheme for RAIDs

The rapid progress in mass storage technology has made it possible for designers to implement large data storage systems for a variety of applications.One of the efficient ways to build large storage systems is to use RAIDs only when one error occurs .But in large RAIDs systems ,the fault probability will increase when the number of disks increases ,and the use of disks with big storage capacity will cause the recovering time to prolong,thus the probability of the second disk‘‘‘‘‘‘‘‘s fault will incerease Therefore,it is necessary to develop methods to recover data when two or more errors have occurred In this paper,a fault tolerant scheme is proposed based on extended Reed-Solomon code,a recovery procedure is designed to correct up to two errors which is implemented by software and hardware together,and the scheme is verified by computer simulation,In this scheme,only two redundant disks are used to recover up to two disks‘‘‘‘‘‘‘‘ fault .The encoding and decoding methods,and the implementation based on software and hardware are described.The application of the scheme in software RAIDs that are builit in cluster computers are also described .Compared with the existing methods such as EVENODD and DH ,the proposed scheme has distinct improvement in implementation and redundancy.     

基于FC-SW存储区域网络的存储系统性能

分析FC-SW存储区域网络(SAN)的网络拓扑结构以及RAID等相关内容,描述在FC-SW SAN中的数据访问流程,在抽象FC-SW SAN的基础上利用排队理论对FC-SW SAN中的存储性能进行分析。阐述磁盘高速缓存命中率、I/O访问读写概率以及网络交换机FC-SW对I/O响应时间的影响。     

Optimal striping in RAID architecture

To access a RAID (redundant arrays of inexpensive disks), the disk stripe size greatly affects the performance of the disk array. In this article, we present a performance model to analyze the effects of striping with different stripe sizes in a RAID. The model can be applied to optimize the stripe size. Compared with previous approaches, our model is simpler to apply and more accurately reveals the real performance. Both system designers and users can apply the model to support parallel I/O events. Copyright © 2000 John Wiley & Sons, Ltd.