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    • 10. 发明授权
    • Systems and methods for a snapshot of data
    • 数据快照的系统和方法
    • US07882071B2
    • 2011-02-01
    • US11507069
    • 2006-08-18
    • Neal T. FachanJustin M. HustedEric M. LemarDarren P. Schack
    • Neal T. FachanJustin M. HustedEric M. LemarDarren P. Schack
    • G06F17/00G06F7/20
    • G06F17/30088G06F17/3015
    • In one embodiment, a user or client device is connected to a distributed file system comprised of one or more physical nodes. The data on each of the physical nodes store metadata about files and directories within the file system. Some of the embodiments permit a user to take a snapshot of data stored on the file system. The snapshot may include a single file, a single directory, a plurality of files within a directory, a plurality of directories, a path on the file system that includes nested files and subdirectories, or more than one path on the file system that each includes nested files and directories. In one embodiment, previous versions of a file or directory are stored only in response to a request to modify the file or directory. The system creates and updates a snapshot tracking data structure which provides information regarding each file or directory governed by the snapshot that was modified or deleted after the snapshot was taken. The snapshot tracking data structure may be used by the system to perform functions related to the snapshot, including deleting the snapshot.
    • 在一个实施例中,用户或客户端设备连接到由一个或多个物理节点组成的分布式文件系统。 每个物理节点上的数据存储有关文件系统内的文件和目录的元数据。 一些实施例允许用户拍摄存储在文件系统上的数据的快照。 快照可以包括单个文件,单个目录,目录内的多个文件,多个目录,文件系统上包括嵌套文件和子目录的路径,或者文件系统上的多于一个路径,每个路径包括 嵌套文件和目录。 在一个实施例中,文件或目录的先前版本仅在响应于修改文件或目录的请求时被存储。 系统创建和更新快照跟踪数据结构,该结构提供有关拍摄快照后修改或删除的快照所管理的每个文件或目录的信息。 系统可以使用快照跟踪数据结构来执行与快照相关的功能,包括删除快照。