发明授权
US06463501B1 Method, system and program for maintaining data consistency among updates across groups of storage areas using update times
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方法，系统和程序，用于使用更新时间维护存储区域组之间的更新之间的数据一致性
- 专利标题： Method, system and program for maintaining data consistency among updates across groups of storage areas using update times
- 专利标题（中）： 方法，系统和程序，用于使用更新时间维护存储区域组之间的更新之间的数据一致性
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申请号： US09422595申请日： 1999-10-21
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公开(公告)号： US06463501B1公开(公告)日： 2002-10-08
- 发明人: Ronald Maynard Kern , Gregory Edward McBride , David Michael Shackelford
- 申请人： Ronald Maynard Kern , Gregory Edward McBride , David Michael Shackelford
- 主分类号： G06F1216
- IPC分类号： G06F1216
摘要：
A system, method, and program for maintaining data consistency among updates to data storage areas are provided. Each update has an update time the update was made. There are multiple groups of data storage areas. For each group, updates to the data storage area in the group are stored in a journal for storing updates to the group, wherein there are multiple journals. An indication is made in a memory area for each group of a group update time comprising a most recent update time of the updates in the group. The update time for each update in the group is not greater than the group update time. A determination is made of a minimum group update time across all the groups. At least one update is applied to storage if the update time for the update does not exceed the minimum group update time. The data storage areas may be partitioned among a plurality of computer systems, and may be maintained in at least one primary and secondary storage. The data storage areas may also comprise volumes, with each group including at least one volume. The groups of updates may also be maintained in a journal.
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