FC和iSCSI协议的分析

光纤通道(Fibre Channel,FC)和iSCSI(Internet SCSI)是目前存储区域网络SAN的两个主流协议。该文介绍FC和iSC-SI协议的协议结构以及流量控制和发现机制。在零复制、流量控制以及发现机制等方面对FC和iSCSI的协议功能进行了分析。     

A polymer of bisphenol A and bisphenol A diglycidyl ether and its blends with poly(styrene‐co‐acrylonitrile): In situ polymerization preparation,morphology, and mechanical properties

The poly(hydroxy ether of bisphenol A)‐based blends containing poly(acrylontrile‐co‐styrene) (SAN) were prepared through in situ polymerization, i.e., the melt polymerization between the diglycidy ether of bisphenol A (DGEBA) and bisphenol A in the presence of poly(acrylontrile‐co‐styrene) (SAN). The polymerization reaction started from the initial homogeneous ternary mixture of SAN/DGEBA/bisphenol A, and the phenoxy/SAN blends with SAN content up to 20 wt % were obtained. Both the solubility behavior and Fourier transform infrared (FTIR) spectroscopy studies demonstrate that no intercomponent reaction occurred in the reactive blend system. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and scanning electronic microscopy (SEM) were employed to characterize the phase structure of the as‐polymerized blends. All the blends display the separate glass transition temperatures (T_g's); i.e., the blends were phase‐separated. The morphological observation showed that all the blends exhibited well‐distributed phase‐separated morphology. For the blends with SAN content less than 15 wt %, very fine SAN spherical particles (1–3 μmm in diameter) were uniformly dispersed in a continuous matrix of phenoxy and the fine morphology was formed through phase separation induced by polymerization. Mechanical tests show that the blends containing 5–15 wt % SAN displayed a substantial improvement of tensile properties and Izod impact strength, which were in marked contrast to those of the materials prepared via conventional methods. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 525–532, 1999     

SAN共聚物组成对PVC/ABS共混物相容性的影响

采用乳液聚合技术通过改变共聚单体的投料比(St/AN)合成了一系列不同AN结合量的ABS接枝共聚物粉料和SAN共聚物.将其与聚氯乙烯(PVC)和邻苯二甲酸二辛酯(DOP)熔融共混分别制得了PVC/ABS、PVC/SAN、PVC/ABS/DOP和PVC/SAN/DOP共混物,利用SEM、TEM和动态力学粘弹谱仪(DMA)对共混物的相容性和相结构进行了表征.结果发现,在PVC/ABS共混体系中,尽管改变接枝SAN共聚物的AN结合量,PVC和SAN共聚物均为不相容体系;在该共混物中引入增塑剂DOP后,虽然当SAN共聚物AN结合量小于23.4 wt%时,共混物在室温以上只存在一个tanδ峰,但形态结构研究结果表明共混物仍为不相容体系,共混物的相区尺寸明显地依赖于SAN共聚物中的AN结合量,当AN结合量为23.4 wt%时相区尺寸最小.     

应用iSNS的iSCSI设备发现及分配机制

iSCSI已成为电信级bnux中重要的应用协议。针对现有iSCSI存储网中资源分散,难以组织的问题,iSNS服务为iSCSI等SAN存储技术提供了存储资源的发现机制,实现了存储资源的分配管理、设备状态变更通知等功能。结合iSNS,在Linux系统中可以通过设备名注册、发现域及登录控制、状态变更通知等技术,完善iSCSI服务的设备发现及分配机制。     

Enhancing oil–water emulsion separation using improved styrene–acrylonitrile copolymer membrane: Experimental and thermodynamic study of the impact of solvent mixtures

This study investigated the fabrication of styrene–acrylonitrile copolymer (SAN) membrane using the nonsolvent-induced phase separation (NIPS) method with a combination of solvents, namely N-methyl-2-pyrrolidone (NMP) and dimethylformamide (DMF) and water as the nonsolvent. Since the impact of varying solvent ratios on SAN membrane performance remained unexplored, this study aimed to address this knowledge gap in the context of oil–water emulsion separation. Experimental results demonstrated that employing a solvent mixture, rather than a pure solvent, led to improved membrane performance. The primary objective of this work was to experimentally determine the optimal solvent ratio for enhancing SAN copolymer membrane performance. Additionally, the Flory–Huggins thermodynamic model was applied to investigate the possibility of predicting membrane binodal data. The thermodynamic analysis revealed a strong agreement between calculated and experimental binodal data, with an error of less than 3.8%. Notably, membranes produced with an equal solvent ratio exhibited the most hydrophilic properties, resulting in increased permeability. The permeate flux for distilled water reached 320 L/(m² h) (LMH), and water contact angle of the membrane was 22°. Furthermore, mechanical resistance increased up to 50%. These results highlight the promising potential of fabricating SAN membrane using solvent mixtures for oil–water emulsion separation.     

异构环境下的iSCSI协议分析与实现

iSCSI协议可以有效解决SAN中数据在IP网络上的传输和共享问题,在对iSCSI协议进行了详细的分析的基础上,给出了在异构环境下利用该协议实现异地数据访问的实现方法.     

一种高效安全的银行数据存储系统研究

浙江建行在实现全省数据集中处理后，原有的数据存储已难以胜任，同时数据集中后对数据的安全和灾难备份提出了很高的要求。为此，从实际需求和技术领先的角度，提出了一种高效、统一、安全的银行数据存储方案。     

基于CWDM的SAN网远程连接应用研究

研究了SAN中的光纤通道技术及目前常用的三种SAN网远程连接技术的优缺点,在分析光网络中的新型波分复用技术CWDM系统基础上,设计并实现一个基于CWDM的SAN网远程连接,其具有不需要数据帧格式转换、数据传输速度快、延迟小、实施成本低适合构建专有线路的远程数据同步镜像容灾系统等特点.     

论数字图书馆网络存储技术的选择

基于存储技术的发展,分析比较了SAN与NAS两种网络架构之间的优劣,旨在为数字图书馆建设提出适宜的网络存储技术架构,同时对长安大学数字图书馆建设项目中网络存储技术的应用情况进行了系统的介绍.     

试论高校数字图书馆动态虚拟网络存储建设

对当前高校图书馆存储系统现状以及存储技术应用情况进行了分析,介绍了SAN 2.0技术,并基于IP以太网提出了一种适合高校数字图书馆的动态虚拟存储方案。