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Highly scalable metadata distribution algorithm in mass storage system 被引量:2
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作者 吴伟 谢长生 +1 位作者 黄建忠 张成峰 《Journal of Shanghai University(English Edition)》 CAS 2008年第5期419-425,共7页
Distribution of metadata in a metadata server cluster is important in mass storage system. A good distribution algorithm has a significant influence on the system performance, availability and scalability. Subtree par... Distribution of metadata in a metadata server cluster is important in mass storage system. A good distribution algorithm has a significant influence on the system performance, availability and scalability. Subtree partition and hash are two traditional metadata distribution algorithms used in distributed file systems. They both have a defect in system scalability. This paper proposes a new directory hash (DH) algorithm. By treating directory as the key value of hash function, implementing concentrated storage of metadata, pipelining operations and prefetching technology, DH algorithm can enhance the system scalability on the premise without sacrificing system performance. 展开更多
关键词 mass storage system metadata server cluster high scalability directory hash (DH)
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Rapid Framing Mass Storage System on the Internet 被引量:1
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作者 Wang Fang Zhang Jiang-ling 《Wuhan University Journal of Natural Sciences》 EI CAS 2000年第3期293-297,共5页
Mass storage system is now very important for storing huge volume of data in many application system such as VOD systems, electronic library, scientific computation and so on. Besides the storage device and network de... Mass storage system is now very important for storing huge volume of data in many application system such as VOD systems, electronic library, scientific computation and so on. Besides the storage device and network devices, the real performance of mass storage system is greatly influenced by the connection way between the host and storage system. Here we propose a new design of mass storage system by promoting the storage devices' functions and involving, them directly into data delivering. It can easily meet the demands both for capacity and I/O bandwidth in those applications, and has better service quality and performance compared with the traditional system in delivering mass data over network. 展开更多
关键词 dual channels mass storage system data bandwidth
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一种基于Windows USB Mass Storage类的信令和数据传输方式
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作者 黄学达 杨俊杰 +2 位作者 侯志鹏 黄俞霖 章世博 《物联网技术》 2022年第7期33-37,共5页
如果USB Mass Storage设备异常断电或拨出,在下一次插入电脑时会从上次中断的地方执行起;但如果USB Mass Storage设备在数据传输过程中出现意外中断,数据传输命令在USB Mass Storage设备重新连接后无法继续执行。针对这一问题,提出了一... 如果USB Mass Storage设备异常断电或拨出,在下一次插入电脑时会从上次中断的地方执行起;但如果USB Mass Storage设备在数据传输过程中出现意外中断,数据传输命令在USB Mass Storage设备重新连接后无法继续执行。针对这一问题,提出了一种在USB Mass Storage设备中设置特定的命令和数据交互区的设计方法。该方法明确划分了基本型和扩展型两种模式;上位机的命令都封装到标准USB写命令数据包中,并保存在USB Mass Storage设备的指定区域,USB Mass Storage设备每次上电都会查询指定区域是否存在命令,若存在则执行,并在完成后将指定区的命令改为响应。通过对上位机下发命令执行过程和下位机接收命令执行过程进行详细分析,证明了该方法的可行性和有效性。 展开更多
关键词 USB mass storage设备 上位机 下位机 数据传输 命令交互 信令
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基于ARM的嵌入式大容量存储设备的设计 被引量:6
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作者 安毅 蔡伯根 《微计算机信息》 北大核心 2008年第17期146-148,共3页
本论文采用USB技术,以SD卡作为存储介质,提出了在AT91SAM7S64处理器上开发USB大容量存储设备的解决方案;本系统基于处理器内嵌的USB设备端口,遵守大容量存储设备类规范,从功能上把系统的实现划分为物理层、设备枚举层、设备响应层和磁... 本论文采用USB技术,以SD卡作为存储介质,提出了在AT91SAM7S64处理器上开发USB大容量存储设备的解决方案;本系统基于处理器内嵌的USB设备端口,遵守大容量存储设备类规范,从功能上把系统的实现划分为物理层、设备枚举层、设备响应层和磁盘功能层四个层次,实现了嵌入式系统与PC的数据交换。 展开更多
关键词 嵌入式系统 USB massstorage SD卡
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基于USB-Host的大容量数据采集系统的设计 被引量:3
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作者 万天军 徐爱钧 李家绪 《单片机与嵌入式系统应用》 2006年第8期52-54,共3页
利用USB主控制器控制U盘作为数据采集系统的移动存储器。该设计基于USB主/从控制芯片CH375S,遵守大容量存储设备类规范中的BulkOnly和UFI子规范,支持FAT16文件系统,实现了数据采集系统中可用U盘进行数据存储,方便与计算机交互;配合液晶... 利用USB主控制器控制U盘作为数据采集系统的移动存储器。该设计基于USB主/从控制芯片CH375S,遵守大容量存储设备类规范中的BulkOnly和UFI子规范,支持FAT16文件系统,实现了数据采集系统中可用U盘进行数据存储,方便与计算机交互;配合液晶和外扩键盘,可以完全抛开PC,实现采集数据的实时显示和指定存储区域内数据的查看。 展开更多
关键词 CH375S USB—Host 数据采集系统 massstorage FAT16文件系统
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Big-Data Analytics:Challenges,Key Technologies and Prospects 被引量:19
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作者 Shengmei Luo Zhikun Wang Zhiping Wang 《ZTE Communications》 2013年第2期11-17,共7页
With the rapid development of the internet, internet of things, mobile internet, and cloud computing, the amount of data in circulation has grown rapidly. More social information has contributed to the growth of big d... With the rapid development of the internet, internet of things, mobile internet, and cloud computing, the amount of data in circulation has grown rapidly. More social information has contributed to the growth of big data, and data has become a core asset. Big data is challenging in terms of effective storage, efficient computation and analysis, and deep data mining. In this paper, we discuss the signif- icance of big data and discuss key technologies and problems in big-data analyties. We also discuss the future prospects of big-data analylics. 展开更多
关键词 big data mass storage data mining business intelligence
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Effect of reactive surface area of minerals on mineralization trapping of CO_2 in saline aquifers 被引量:5
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作者 LUO Shu XU Ruina JIANG Peixue 《Petroleum Science》 SCIE CAS CSCD 2012年第3期400-407,共8页
The reactive surface area, an important parameter controlling mineral reactions, affects the amount of mineralization trapping of CO2 which affects the long-term CO2 storage. The effect of the reactive surface area on... The reactive surface area, an important parameter controlling mineral reactions, affects the amount of mineralization trapping of CO2 which affects the long-term CO2 storage. The effect of the reactive surface area on the mineralization trapping of CO2 was numerically simulated for CO2 storage in saline aquifers. Three kinds of minerals, including anorthite, calcite and kaolinite, are involved in the mineral reactions. This paper models the relationship between the specific surface area and the grain diameter of anorthite based on experimental data from literature (Brantley and Mellott, 2000). When the reactive surface areas of anorthite and calcite decrease from 838 to 83.8 m^2/m^3, the percentage of mineralization trapping of CO: after 500 years decreases from 11.8% to 0.65%. The amount of dissolved anorthite and the amounts of precipitated kaolinite and calcite decrease significantly when the reactive surface areas ofanorthite and calcite decrease from 838 to 83.8 m2/m3. Calcite is initially dissolved in the brine and then precipitates during the geochemical reactions between CO2-H20 and the minerals. Different reactive surface areas of anorthite and calcite lead to different times from dissolution to precipitation. The pH of the brine decreases with decreasing reactive surface areas of anorthite and calcite which influences the acidity of the saline aquifer. The gas saturation between the upper and lower parts of the saline aquifer increases with decreasing reactive surface areas of anorthite and calcite. The mass density distribution of brine solution shows that the CO2^+brine solution region increases with decreasing reactive surface areas ofanorthite and calcite. 展开更多
关键词 Reactive surface area mineralization trapping dissolution precipitation brine mass density CO2 geological storage
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