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    • 7. 发明申请
    • Managing snapshot history in a data storage system
    • 管理数据存储系统中的快照历史记录
    • US20070067583A1
    • 2007-03-22
    • US11229954
    • 2005-09-19
    • Ofir ZoharShemer SchwartzEfri Zeidner
    • Ofir ZoharShemer SchwartzEfri Zeidner
    • G06F12/16G06F12/00
    • G06F11/1458G06F2201/84
    • A method for creating logical volume snapshots in a data storage system, including receiving a first write command to write first data to a partition of a logical volume, generating a first partition descriptor record (PDR), and storing the first data at a first physical location associated with the first PDR. A snapshot command is then received to form a snapshot of the logical volume, after which a second write command is received to write second data to the partition. In response to the second write command, a second PDR is generated and the second data is stored at a second physical location associated with the second PDR. A pointer between the first PDR and the second PDR is generated. In response to a read command indicating a number of a desired snapshot of the logical volume, the first PDR is accessed using the pointer.
    • 一种用于在数据存储系统中创建逻辑卷快照的方法,包括接收第一写入命令以将第一数据写入逻辑卷的分区,生成第一分区描述符记录(PDR),以及将第一数据存储在第一物理 与第一个PDR相关联的位置。 然后接收快照命令以形成逻辑卷的快照,之后接收到第二写入命令以将第二数据写入分区。 响应于第二写命令,产生第二PDR,并且第二数据被存储在与第二PDR相关联的第二物理位置处。 生成第一PDR和第二PDR之间的指针。 响应于指示逻辑卷的所需快照的数量的读取命令,使用指针访问第一PDR。