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
在传统的块级持续数据保护(continuous data protection,CDP)技术中,为了减少恢复时遍历元数据记录的时间、加快恢复速度,通常需要定期插入受保护卷的快照.频繁插入快照提升了恢复速度的同时也大大增加了存储压力.针对传统快照方法占用...在传统的块级持续数据保护(continuous data protection,CDP)技术中,为了减少恢复时遍历元数据记录的时间、加快恢复速度,通常需要定期插入受保护卷的快照.频繁插入快照提升了恢复速度的同时也大大增加了存储压力.针对传统快照方法占用存储空间大的问题,提出了一种改进的快照方法MS-CDP.在元数据记录中增加顺序索引号、前项指针和后项指针.需要插入快照时,无需保留当前时刻的完整映射表,通过时间戳和块号的函数关系,只保留极值点对应的映射表表项即可.经实验证明,该方法显著地减少了快照的存储空间,降低了CDP系统服务端的存储压力.展开更多
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.
文摘在传统的块级持续数据保护(continuous data protection,CDP)技术中,为了减少恢复时遍历元数据记录的时间、加快恢复速度,通常需要定期插入受保护卷的快照.频繁插入快照提升了恢复速度的同时也大大增加了存储压力.针对传统快照方法占用存储空间大的问题,提出了一种改进的快照方法MS-CDP.在元数据记录中增加顺序索引号、前项指针和后项指针.需要插入快照时,无需保留当前时刻的完整映射表,通过时间戳和块号的函数关系,只保留极值点对应的映射表表项即可.经实验证明,该方法显著地减少了快照的存储空间,降低了CDP系统服务端的存储压力.
