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US08271753B2 Storage controller and storage control method for copying a snapshot using copy difference information 有权
使用复制差异信息复制快照的存储控制器和存储控制方法

Storage controller and storage control method for copying a snapshot using copy difference information
摘要：
Difference information between two snapshots from a first point-in-time snapshot, which has been copied, to an Nth point-in-time snapshot, which constitutes the latest point-in-time snapshot, is acquired to a memory module. The memory module stores two or more pieces of difference information. The two or more pieces of difference information comprise difference information that shows the difference between a first point-in-time snapshot and any snapshot other than the first point-in-time snapshot of N snapshots. Copy difference information, which is information that shows the difference between the first point-in-time snapshot and a specified snapshot from among N snapshots, and which is used in copying the specified snapshot, is created on the basis of the two or more pieces of difference information.
摘要（中）：

从已经被复制的第一时间点快照到构成最新时刻快照的第N个时刻快照的两个快照之间的差异信息被获取到存储器模块。 存储器模块存储两个或更多个差异信息。 两条或更多条差异信息包括差异信息，其显示第一时间点快照与N个快照的第一时间点快照之外的任何快照之间的差异。 复制差异信息，它是显示N个快照中第一个时间点快照和指定快照之间的区别的信息，以及复制指定快照时使用的差异信息，是基于两个或多个部分 的差异信息。

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