By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the statio...By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the station with line fault to the destination by short message way. The system has simple operation and low operation cost, and transmission fault of real-time meteorological data due to line problem at the station can be effectively decreased. At present, the system has been tested successfully and put into business operation.展开更多
Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarante...Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D rea-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.展开更多
This paper describes a method for building hot snapshot copy based on windows-file system （HSCF）. The architecture and running mechanism of HSCF are discussed after giving a comparison with other on-line backup tecb...This paper describes a method for building hot snapshot copy based on windows-file system （HSCF）. The architecture and running mechanism of HSCF are discussed after giving a comparison with other on-line backup tecbnology. HSCF, based on a file system filter driver, protects computer data and ensures their integrity and consistency with following three steps： access to open files, synchronization and copy on-write. Its strategies for improving system performance are analyzed including priority setting, incremental snapshot and load balance. HSCF is a new kind of snapshot technology to solve the data integrity and consistency problem in online backup, which is different from other storage-level snapshot and Open File Solution.展开更多
重复数据删除技术有效地提升了备份系统的备份效率,但重复数据的匹配开销也随之增加.针对该问题,设计并实现了一种基于重复数据删除的备份系统THBS,该系统提出了高精简的数据备份方法HAD(hierachical approach of data deduplication),...重复数据删除技术有效地提升了备份系统的备份效率,但重复数据的匹配开销也随之增加.针对该问题,设计并实现了一种基于重复数据删除的备份系统THBS,该系统提出了高精简的数据备份方法HAD(hierachical approach of data deduplication),依次从目录、文件、块、字节粒度分层多步,由粗及细地匹配删除重复数据,同时采用bloomfilter和倒排索引技术,以减少不必要的数据匹配与磁盘访问,提高匹配查找速度.通过两组真实数据集的实验发现,THBS在备份过程中节省了63.1%～96.7%的存储空间,比Scp和Rsync分别节约了71.3%～97.6%,41.2%～66.7%的网络带宽,累计备份时间分别为Scp和Rsync的75%～86%和91%～97%.展开更多
文摘By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the station with line fault to the destination by short message way. The system has simple operation and low operation cost, and transmission fault of real-time meteorological data due to line problem at the station can be effectively decreased. At present, the system has been tested successfully and put into business operation.
基金Supported by the 10th Five Year High-Tech Researchand Development Plan of China (2002AA1Z67101)
文摘Highly security-critical system should possess features of continuous service. We present a new Robust Disaster Recovery System Model （RDRSM）. Through strengthening the ability of safe communications, RDRSM guarantees the secure and reliable command on disaster recovery. Its self-supervision capability can monitor the integrality and security of disaster recovery system itself. By 2D and 3D rea-time visible platform provided by GIS, GPS and RS, the model makes the using, management and maintenance of disaster recovery system easier. RDRSM possesses predominant features of security, robustness and controllability. And it can be applied to highly security-critical environments such as E-government and bank. Conducted by RDRSM, an important E-government disaster recovery system has been constructed successfully. The feasibility of this model is verified by practice. We especially emphasize the significance of some components of the model, such as risk assessment, disaster recovery planning, system supervision and robust communication support.
基金Supported by the National Natural Science Foun-dation of China (60473023) National Innovation Foundation forSmall Technology Based Firms(04C26214201280)
文摘This paper describes a method for building hot snapshot copy based on windows-file system （HSCF）. The architecture and running mechanism of HSCF are discussed after giving a comparison with other on-line backup tecbnology. HSCF, based on a file system filter driver, protects computer data and ensures their integrity and consistency with following three steps： access to open files, synchronization and copy on-write. Its strategies for improving system performance are analyzed including priority setting, incremental snapshot and load balance. HSCF is a new kind of snapshot technology to solve the data integrity and consistency problem in online backup, which is different from other storage-level snapshot and Open File Solution.
文摘重复数据删除技术有效地提升了备份系统的备份效率,但重复数据的匹配开销也随之增加.针对该问题,设计并实现了一种基于重复数据删除的备份系统THBS,该系统提出了高精简的数据备份方法HAD(hierachical approach of data deduplication),依次从目录、文件、块、字节粒度分层多步,由粗及细地匹配删除重复数据,同时采用bloomfilter和倒排索引技术,以减少不必要的数据匹配与磁盘访问,提高匹配查找速度.通过两组真实数据集的实验发现,THBS在备份过程中节省了63.1%～96.7%的存储空间,比Scp和Rsync分别节约了71.3%～97.6%,41.2%～66.7%的网络带宽,累计备份时间分别为Scp和Rsync的75%～86%和91%～97%.
