Performance analysis of an iSCSI-based unified storage network

In this paper, we introduced a novel storage architecture “Unified Storage Network“, which merges NAC( Network Attached Channel) and SAN( Storage Area Network) , and provides the file I/O services as NAS devices and provides the block I/O services as SAN. To overcome the drawbacks from FC, we employ iSCSI to implement the USN( Unified Storage Network) . To evaluate whether iSCSI is more suitable for implementing the USN, we analyze iSCSI protocol and compare it with FC protocol from several components of a network protocol which impact the performance of the network. From the analysis and comparison, we can conclude that the iSCSI is more suitable for implementing the storage network than the FC under condition of the wide-area network. At last, we designed two groups of experiments carefully.     

SAN与NAS介绍

一、存储体系结构说明 目前开放式系统里面，存储系统基本分为：内置存储和外挂存储；而外挂存储根据连接的方式分为：直连式存储（Direct—Attached Storage，简称DAS）和网络化存储（Fabric—Attached Storage，简称FAS）：网络化存储根据传输协议又可细分为：网络接入存储（Net—work-Attached Storage，简称NAS）和存储区域网络（Storage Area Network，简称SAN）。     

基于NAS和SAN技术的校园网数据存储结构策略

基于校园网数据存储的实际需求,在分析当前校园网数据存储存在问题和实际需求特征的基础上,系统研究了网络附加存储技术(NAS,Network Attached Storage)和存储区域网络技术(SAN,Storage Area Network)的技术特点,构建了基于NAS和SAN技术校园网数据存储结构的策略模型,该模型提...     

Auditing the Use of DBMS Covert Storage Channels Relevant with Transactions

This paper proposes the concept of transation-type covert storage channels,which are caused by database storage resources.It also proposes that the mode of auditing those channels be based on the transactions.Next,the paper analyzes and resolves the two problems arising from auditing the use of transaction-type covert storage channels in database systems:namely,the relationship between channel variables,which are altered(or viewd)by the transaction and satisfyintegrity constraints in DBMS,and database states;and the circumvention of covert storage channel audit in DBMS.     

Design and Implementation of a Storage Virtualization System Based on SCSI Target Simulator in SAN

The ideal storage virtualization system is compatible with all operating systems in storage are anetworks (SANs). However, current storage systems on clustered hosts and multiple operating systems are not practical. This paper presents a storage virtualization system based on a SCSI target simulator in a SAN to solve these problems. This storage virtualization system runs in the target hosts of the SAN, dynamically stores the physical information, and uses the mapping table method to modify the SCSI command addresses. The system uses the bitmap technique to manage the free space. The storage virtualization system provides various functions, such as logical volume resizing, data mirroring, and snapshots, and is compatible with clustered hosts and multiple operating systems, such as Windows NT and RedHat.     

日立推出无存储网络终端

日本最大的电子产品制造商日立公司1月4日表示，为预防该公司数据可能遭到泄露，该公司将会用没有存储功能的网络终端(Network Terminal)来替代公司的笔记本电脑。     

Miniaturized volume holographic optical data storage and correlation system with a storage density of 10 Gb／cm^3

The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm^3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage methods in the information storage as well as information processing.     

Design and Implementation of SCSI Target Emulator

Introduction With the explosion in the amount of information, the performance and scalability of storage systems have become critical issues along with the system cost-effectiveness. Storage area network (SAN)[1] is a new storage system model with excelle…     

存储区域网在企业数据存储中的应用研究

随着科技的进步和时代的发展,由服务器直接连接和管理存储设备的传统网络存储模式已难以满足企业日益增长的信息传输、存储和管理的需求,在这种情况下,存储域网络(Storage Area Network,SAN)便应运而生.     

一种基于SAN共享存储的自适应存储系统的设计及实现

本在详细分析了目前处理SAN(Storage Area Network)中共享存储的各种方法之后，指出了它们的不足，并针对空闲区管理和分配及分区重构问题提出了具体解决办法和相应的实现流程。这一改进较好地弥补了传统方法的不足。     

基于IP的网络存储应用研究

本文主要介绍了附网存储(NAS)和存储局域网(SAN)的构造思想及其各自的优缺点，着重介绍了基于IP的网络存储技术以及三个关键问题的解决方案。     

统一存储网的研究和设计

NAS为用户提供件I／O服务,SAN为用户提供数据块I／O服务,计算机应用的发展要求存储网络同时提供2种服务．统一存储网(USN)利用TCP／IP协议,将NAS和IP-SAN整合成单一的存储空间,同时为用户提供件I／O和数据块I／O2种服务．理论分析和实验证明这种方案是可行的。     

多模块结构的性能评估模型

计算机技术和网络技术逐渐成熟,计算机处理能力和相关数据需求不断增长,使得存储技术的发展得到更多的市场驱动,网络存储的浪潮随之到来。本文讨论通用、可配置性能评估模型的实现方法。首先讨论模块划分的方法,接着讨论模块的功能分配方法,最后以一个实例分析多模块结构怎样用于性能评估。     

Linux操作系统中存储子系统的Target模式仿真与研究

存储网络Target端的技术发展,目的就是将网络和设备的通讯协议与传输物理介质隔离开,体现了功能细分的思想。将多种协议可在同一个物理连接上同时传送,并且高性能存储体和宽带网络使用单I／O接口使得系统的成本和复杂程度大大降低。本文将阐明Target模式的特点．并研究在Linux存储子系统中Target模式的性能指标分析。     

存储技术在数字图书馆中的应用

论述了数字图书馆的存储技术,包括直接存储和网络存储技术,并对其发展趋势作了一些探讨.     

数字图书馆数据存储系统解决方案的探讨

文章分析了传统数据存储系统的缺陷和不足,着重介绍了SAN存储的技术特性和解决方案,结合实际应用,提出了图书馆在构建SAN存储解决方案时必须综合考虑的因素,以及SAN将成为数字图书馆数据存储系统发展的趋势.     

一种基于iSCSI的SAN存储虚拟化实现

在研究现有的SAN技术的基础上，提出了一种新的基于iSCSI的SAN存储虚拟化的实现．该实现融合了SAN和NAS的特点，能够同时对文件和数据块进行存取，通过采用逻辑卷管理和映射管理等技术在基于iSCSI的IP—SAN平台上实现了存储虚拟化的功能，具有使用灵活方便的特点．     

虚拟化存储技术的I/O调度研究

虚拟存储是存储技术发展的重要方向,它屏蔽了大量异构设备的差异性,向用户提供简单的逻辑存储访问接口。通过虚拟层的I/O调度,应用程序对虚拟存储空间的I/O请求被转化为对物理存储设备操作的I/O命令。介绍了虚拟化存储技术的I/O调度的三个层次：主机级、设备级和网络级,分析了中间驱动层虚拟存储I/O调度机制和适配器驱动层虚拟存储I/O调度机制,最后探讨了虚拟存储I/O调度的智能化和并行化。     

影响林木种子贮藏的因素

为了每年提供造林新需的具有生活力的种子及长期保存种质资源,贮藏种子是必要的手段。种子寿命具有遗传性,且因树种而异。种子的贮藏特性可以分成5类:正常型、亚正常型、温带顽拗型、热带顽拗型和中间型。种子含水量和贮藏温度是影响种子贮藏是否成功的两个最重要因素。但因树种及其贮藏特性不同,种子含水量和贮藏温度的最适值也不同。为了保持正常型和亚正常型种子的生活力,这类种子必须密封贮藏;但对顽拗型种子,因其需要保持种子的代谢活性及要进行有氧呼吸,则需要气体交换。     

三水合醋酸钠—乙酰胺低共熔混合物潜热贮能的研究

本文用差示扫描量热法(DSC)研究了CH_3 COONa·3H_2O—CH_3 CONH_2拟二元系统,发现其低共熔混合物在28℃时发生同分共熔,其熔化热为231J/g。从相变温度和贮热容量考查,该低共熔混合物是一种良好的太阳能潜热贮能材料。