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    • 1. 发明申请
    • SYSTEM AND METHOD FOR FACILITATING A CONSISTENT POINT-IN-TIME COPY
    • 促进一致性时间复制的系统和方法
    • WO2005109252A1
    • 2005-11-17
    • PCT/US2005/009291
    • 2005-03-21
    • SUN MICROSYSTEMS, INCWONG, Brian L.ROBINSON, DavidMCDOUGALL, Richard J.SHEPLER, Spencer
    • WONG, Brian L.ROBINSON, DavidMCDOUGALL, Richard J.SHEPLER, Spencer
    • G06F17/30
    • G06F17/30088
    • A system and method for facilitating a consistent point-in-time copy (PITC). A data provider offers access to data by one or more clients. A client issues a PITC request for a set of data to the data provider, or the provider initiates its own request. The data provider instructs one or more clients, particularly clients accessing the set of data, to flush any pending updates. The clients acknowledge the flush request, flush their data, and notify the data provider when their flushes are complete. Post-consistency updates are deferred (e.g., using a write-aside buffer). If a client fails to acknowledge the flush request or notify of flush completion, the data provider may abort the PITC or continue because the data may not be consistent or consistency may not be assured. If not aborted, the PITC may be marked to indicate that it is incomplete.
    • 一种用于促进一致的时间点复制(PITC)的系统和方法。 数据提供者提供一个或多个客户端对数据的访问。 客户端向数据提供者发出一组数据的PITC请求,或提供者发起自己的请求。 数据提供者指示一个或多个客户端,特别是访问数据集的客户端,以刷新任何未完成的更新。 客户端确认刷新请求,刷新其数据,并在其刷新完成时通知数据提供者。 后续一致性更新被推迟(例如,使用写缓冲区)。 如果客户端无法确认刷新请求或通知刷新完成,则数据提供者可能会中止PITC或继续,因为数据可能不一致或一致性可能无法保证。 如果没有中止,PITC可能被标记为表示它是不完整的。