发明申请
US20040260895A1 Method, system, and program for reverse restore of an incremental virtual copy
失效
用于反向恢复增量虚拟副本的方法，系统和程序
- 专利标题： Method, system, and program for reverse restore of an incremental virtual copy
- 专利标题（中）： 用于反向恢复增量虚拟副本的方法，系统和程序
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申请号： US10464918申请日： 2003-06-18
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公开(公告)号： US20040260895A1公开(公告)日： 2004-12-23
- 发明人: Sam Clark Werner , William Frank Micka , Dalit Tzafrir , Matthew Sanchez , Sivan Tal , Ifat Nuriel , Sheli Rahav , Gail Andrea Spear , Warren K. Stanley , Thomas Charles Jarvis , Amiram Hayardeny , Shachar Fienblit , Rivka Mayraz Matosevich , Svetlana Shukevich , Theresa Mary Brown
- 主分类号： G06F012/16
- IPC分类号： G06F012/16
摘要：
Disclosed is a technique for applying changes back to an original copy of data to reduce an amount of data transferred. A first indicator is maintained for each block of data in a first storage to indicate whether the block of data has been updated in the first storage since the block of data was last transferred to a second storage. A second indicator is maintained for each block of data in the second storage to indicate whether the block of data has been updated in the second storage since the block of data in the second storage was overwritten by a corresponding block of data in the first storage. Upon receiving a reverse restore operation, each block of data in the second storage for which a second indicator has been set to indicate that the block of data has been updated is transferred to the first storage and each block of data in the second storage that corresponds to a block of data in the first storage for which a first indicator has been set to indicate that the block of data in the first storage has been updated is transferred to the first storage.
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