Invention Application
US20070100917A1 Method and apparatus for avoiding journal overflow on backup and recovery system using storage based journaling 失效
用于使用基于存储的日志记录来避免备份和恢复系统上的日志溢出的方法和装置

  • Patent Title: Method and apparatus for avoiding journal overflow on backup and recovery system using storage based journaling
  • Patent Title (中): 用于使用基于存储的日志记录来避免备份和恢复系统上的日志溢出的方法和装置
  • Application No.: US11640933
    Application Date: 2006-12-19
  • Publication No.: US20070100917A1
    Publication Date: 2007-05-03
  • Inventor: Takashi AmanoKenji Yamagami
  • Applicant: Takashi AmanoKenji Yamagami
  • Assignee: Hitachi,Ltd.
  • Current Assignee: Hitachi,Ltd.
  • Main IPC: G06F17/30
  • IPC: G06F17/30
Method and apparatus for avoiding journal overflow on backup and recovery system using storage based journaling
Abstract:
A method and apparatus which provide solutions for avoiding journal overflow in after and before journal methods of a backup and recovery system used with a storage system. The after journal method solutions, which are conducted when the amount of free space reaches a threshold, include periodically taking a new snapshot and deleting the oldest journal, periodically taking a new logical snapshot and deleting the oldest journal, stopping the taking journal entries when the journal volume is full, and stopping the taking journal entries when the journal volume is full and then switching to bitmap management. The before journal method solution, which is conducted when the amount of free space reaches a threshold, includes applying wrap-around overwriting to overwrite the oldest journal entry by the newest journal entry.
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