Database backup system ensuring consistency between primary and mirrored backup database copies despite backup interruption

摘要: A database management system ensures consistency between primary and mirrored backup copies of a database, despite occurrence suspending condition interrupting the normal process mirroring database. One or more controllers are provided, each having data storage unit with multiple devices. Multiple secondary have associated devices, controller being coupled to one controller. databases reside on corresponding number residing Each mirrors Either host, attached controller, itself, maintains map cross-referencing devices containing portions thereof. If predefined “suspending condition” affecting occurs, host consults its identify all affected by condition. Then, stops ongoing future read/writes also directs an device stop stored that device. starts intermediate change recording resumes When ends, applies appropriate logged changes database(s) then reactivates