一种磁盘阵列系统内部组件的互联方法

一台高端磁盘阵列通过存储局域网直接连接到多台高端小型机，通常会产生资源的竞争。通过增加磁盘控制组建对整个系统的资源进行综合配置，可以有效的避免竞争。本文针对这种磁盘阵列，提出了一种具体的内部组件的互联方法。     

高端磁盘阵列可靠性测试建模方法研究

阐述了衡量高端磁盘阵列可靠性的重要指标MTTDL,通过分析两种造成磁盘错误的原因,建模计算了各种RAID级别的MTTDL,设计了磁盘读出错率的测试方案,实现了基于分布式的磁盘读出错率测试程序。     

分布式磁盘阵列的结构及冗余策略

分布式磁盘阵列对于提高数据存储的可靠性、带宽和容量，具有十分重要的意义。本文介绍了分布式磁盘阵列的两种连接方式，磁盘分布连接到计算机和磁盘阵列连接到网络，以及在分布式磁盘阵列中得到应用的两种冗余策略，Chained declustering和RAID-x。     

IBM DS4800磁盘阵列 高端性能 中端价位

产品特色:IBMDS4800是第一款支持4Gbps光纤通道接口技术的磁盘阵列,带宽速度最高达1600Mbps,不仅支持光纤通道硬盘驱动器,还支持SATA硬盘驱动器。针对于高端存储系统市场不断萎缩,中端存储系统市场急剧增长的市场态势,IBM8月面向中端存储系统市场推出了IBMDS4800磁盘阵列。该产     

分布式磁盘陈列的性能分析

本文提出一种分布式磁盘阵列的基本结构，并用解析和仿真两种方法进行了性能分析。结果表明它在磁盘利用率与平均响应时间等方面都明显优于集中式磁盘阵列。     

分布式磁盘阵列的性能分析

本文提出一种分布式磁盘阵列的基本结构，并用解析和仿真两种方法进行了性能分析。结果表明它在磁盘利用率与平均响应时间等方面都明显优于集中式磁盘阵列。     

磁盘阵列状态实时监控的通用性解决方案

针对当前磁盘阵列(redundantarray of independentdisks,RAID)商家众多,缺乏统一监控工具这一缺陷,引入了一种通用性解决方案。以简单网络管理协议为基础,使用NET-SNMP添加磁盘阵列状态的监控模块,同时使用CACTI对磁盘阵列进行实时监控,并在发生异常时通过邮件和短信报警。该方案选用应用最广泛的软、硬两种RAID5级别进行测试。测试结果表明,该方案可实现各种磁盘阵列的统一监控管理和异常报警。     

无忧存储之道——惠普XP512磁盘阵列剖析

近日惠普公司的Surestore磁盘阵列XP512存储产品,被授予Crossroads A-List最佳“商业和技术基础设施”奖,惠普Surestore磁盘阵列XP512存储产品究竟有什么独特之处呢?惠普在存储浪潮中将会有什么新的动向呢? 纵览HP Surestoro E XP 512 HP Surestore磁盘阵列XPS12是惠普的旗舰产品,它是第一款为企业和服务供应商提供的高端存储解决方案,主要面向灾难恢复、地区数据中心或单应用环境中     

巨狮低价出击 华硕P5Q SE主板

优点:售价相对便宜,大量高端特色功能得到保留不足:ICH10南桥不提供磁盘阵列功能,处理器供电电路被大幅简化亮点指数:8.5实用指数:9推荐指数:9966元800-820-6655继高端P45主板取得成功后,华硕加紧了旗下     

惠普帮你逢灾灭灾

惠普公司1月18日演示了基于其高端存储器产品HP SureStore E XP256磁盘阵列的数据中心冗灾解决方案。该方案选用了惠普智能磁盘控制技术,通过HP SureStore EXP256,实现相隔遥远的主数据中心和备份中心的操作系统、文件系统、数据库的实时拷贝维护。主、备中心磁盘阵列本身就可以通过阵列上的微处理器完成数据实时同步功能,将数据的损失降至最     

Characterizing and optimizing TPC-C workloads on large-scale systems using SSD arrays在大规模系统上优化 TPC-C 评测程序

Transaction processing performance council benchmark C (TPC-C) is the de facto standard for evaluating the performance of high-end computers running on-line transaction processing applications. Differing from other standard benchmarks, the transaction processing performance council only defines specifications for the TPC-C benchmark, but does not provide any standard implementation for end-users. Due to the complexity of the TPC-C workload, it is a challenging task to obtain optimal performance for TPC-C evaluation on a large-scale high-end computer. In this paper, we designed and implemented a large-scale TPC-C evaluation system based on the latest TPC-C specification using solid-state drive (SSD) storage devices. By analyzing the characteristics of the TPC-C workload, we propose a series of system-level optimization methods to improve the TPC-C performance. First, we propose an approach based on SmallFile table space to organize the test data in a round-robin method on all of the disk array partitions; this can make full use of the underlying disk arrays. Second, we propose using a NOOP-based disk scheduling algorithm to reduce the utilization rate of processors and improve the average input/output service time. Third, to improve the system translation lookaside buffer hit rate and reduce the processor overhead, we take advantage of the huge page technique to manage a large amount of memory resources. Lastly, we propose a locality-aware interrupt mapping strategy based on the asymmetry characteristic of non-uniform memory access systems to improve the system performance. Using these optimization methods, we performed the TPC-C test on two large-scale high-end computers using SSD arrays. The experimental results show that our methods can effectively improve the TPC-C performance. For example, the performance of the TPC-C test on an Intel Westmere server reached 1.018 million transactions per minute.     

Performance analysis of advanced I/O architectures for PC-based video servers

In the personal computing and workstation environments, more and more I/O adapters are becoming complete functional subsystems that are intelligent enough to handle I/O operations on their own without much intervention from the host processor. The IBM subsystem control block (SCB) architecture has been defined to enhance the potential of these intelligent adapters by defining services and conventions that deliver command information and data to and from the adapters. In recent years, a new storage architecture, the redundant array of independent disks (RAID), has been quickly gaining acceptance in the world of computing. In this paper, we discuss and present a performance analysis of the SCB architecture and disk array technology in typical video server environments. In particular, we would like to see whether a disk array can outperform a group of disks (of the same type, the same data capacity, and same cost) operating independently (not in parallel as in a disk array) in a video server environment where most disk I/O operations are large sequential reads.     

Efficient video file allocation schemes for video-on-demand services

A video-on-demand (VOD) server needs to store hundreds of movie titles and to support thousands of concurrent accesses. This, technically and economically, imposes a great challenge on the design of the disk storage subsystem of a VOD server. Due to different demands for different movie titles, the numbers of concurrent accesses to each movie can differ a lot. We define access profile as the number of concurrent accesses to each movie title that should be supported by a VOD server. The access profile is derived based on the popularity of each movie title and thus serves as a major design goal for the disk storage subsystem. Since some popular (hot) movie titles may be concurrently accessed by hundreds of users and a current high-end magnetic disk array (disk) can only support tens of concurrent accesses, it is necessary to replicate and/or stripe the hot movie files over multiple disk arrays. The consequence of replication and striping of hot movie titles is the potential increase on the required number of disk arrays. Therefore, how to replicate, stripe, and place the movie files over a minimum number of magnetic disk arrays such that a given access profile can be supported is an important problem. In this paper, we formulate the problem of the video file allocation over disk arrays, demonstrate that it is a NP-hard problem, and present some heuristic algorithms to find the near-optimal solutions. The result of this study can be applied to the design of the storage subsystem of a VOD server to economically minimize the cost or to maximize the utilization of disk arrays.     

Amake: cached builds of top-level targets

This paper describes a software-build tool named Amake, an extension of GNU Make. Its additional features solve important problems that have, until now, only been addressed by “high-end” build tools (e.g., ClearCase and Vesta).With a typical build tool, if a top-level target must be updated, intermediate targets must be built from sources, and then combined to build the top-level target. The enhancements described here allow a top-level target to be fetched from a shared cache, without building, or even fetching its intermediate-target dependencies. Thus, a developer’s workspace may need only contain sources and top-level targets. This reduces build time, reduces network traffic, and saves disk space.     

一种提高磁盘阵列I/O性能的策略

通过资源重复途径构的磁盘阵列Ｉ／Ｏ系统,有效地提高了Ｉ／Ｏ系统的数传率和响应时间。但是、由于Ｉ／Ｏ负载大的使用环境,常规阵列控制策略不能较好地发挥阵列系统的性能。本文提出了一种适合于Ｉ／Ｏ负载变化大的改进阵列控制策略,并分析这种改进策略的Ｉ／Ｏ性能,阳后用ＱＢＥＮＣＨ分别对常规策略和改进策略测试了Ｉ／Ｏ响应时间和数传率。     

磁盘存储测试技术研究

研究了测试海量存储系统中磁盘阵列IOPS、数据传输率两项性能指标的技术与方法,提出了针对高性能磁盘阵列的并行测试技术,并使用此方法实现了对最新研制的高性能磁盘阵列的评测。通过研究影响单个磁盘性能指标的各项因素,并借助实验对其进行量化分析,最终实现了对整个磁盘阵列的性能评测。研究了影响磁盘阵列整体性能的关键瓶颈点,并给出了各项测试结果的合理性证明。     

基于磁盘阵列的VLBI计算机存储系统

完成对深空测控外部存储系统磁盘阵列的设计是深空战略工作中的一部分.本文在分析磁盘组阵各性能的基础上,为深空测控计算机外部存储系统给出磁盘阵列组阵建议.根据深空测控任务要求出发,对磁盘的各组阵方式的容量、速度和可靠性等方面进行理论分析和实际测量,结果显示RAID0组阵方式是符合存储系统需求的组阵方式.     

一种SCSI目标器设计与评估

SCSI目标器是磁盘阵列控制器软件中的关键组成部分之一;设计并实现了一种SCSI目标器,详细描述了SCSI目标器的功能及其内部体系结构,阐述了目标器对读写请求的不同处理流程;该SCSI目标器是可配置的,它既能够辅助磁盘阵列控制器软件系统开发,也能够胜任磁盘阵列控制器SCSI目标器的功能;为了验证该SCSI目标器的性能,采用相关评测工具对其有负载和无负载两种情况的读写性能进行了评测,测试结果表明该SCSI目标器的实际性能达到了预期的设计目标。     

磁盘阵列的电子物证检验研究

磁盘阵列在信息系统中的应用越来越广泛。由于磁盘阵列基于磁盘组合进行数据存储．单独的磁盘数据通常总是不完整的数据,无法从中获取能够理解的内容,这就需要对磁盘阵列的数据存储组织方式进行深入研究,按照其组织方式进行数据重组,即使超出了阵列的冗余能力,也必须对缺失的数据进行补0处理后执行不完整重组,从而最大限度地获取可读数据,为查办案提供有力的数字证据,本论文正是这一课题的简要总结。     

基于FC接口的Hyper-RAID设计与研究

超级磁盘阵列（Hyper-RAID）在其内部划分逻辑卷和逻辑单元,实现了层次化的多级复合阵列结构.它与服务器的连接采用光纤通道接口（FC）,利用FCP-SCSI协议,将阵列内部的每个逻辑单元映射为服务器端的一个物理磁盘设备,从而实现了多阵列功能.研究分析表明,这种多层次的多阵列结构和普通的单阵列相比具有更好的容错性能,而且还能对不不同重要等级的数据分类存储.