System and method for creating online snapshots
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United States of America Patent
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N/A
Issued Date -
May 15, 2003
app pub date -
Nov 15, 2001
filing date -
Nov 15, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An improved method and system for creating online snapshots. Files (e.g., database files) are registered with a snapshot software component technology by a backup software utility. A methodology (e.g., software or hardware based) to backup each file is determined. For the software methodology, captured reads for updated data receive data returned from the cache; captured reads for non-updated data receive data returned from the registered file; a pre-image of an appropriate data block of the registered file for captured writes is saved to a cache if the data block has no previously saved pre-image. The backup is consistent with the state of each registered file at the point in time of the start of the snapshot software component technology. Non-updated data is copied from the registered file to a backup device; a pre-image version of updated data is copied to the backup device.
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