Instantaneous restoration of a production copy from a snapshot copy in a data storage system
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United States of America Patent
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Oct 18, 2005
Grant Date -
Feb 12, 2004
app pub date -
Aug 6, 2002
filing date -
Aug 6, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A data storage system maintains a production dataset supported by a clone volume, and multiple snapshot datasets supported by respective save volumes in a snapshot queue. In order to instantaneously restore the production dataset with the state of any specified snapshot, the data storage system responds to requests for read/write access to the production dataset by reading from the specified snapshot dataset and writing to the production dataset. The data storage system keeps a record of data blocks that have been modified by writing to the production dataset. The data storage system initiates a process of copying data blocks from the specified snapshot dataset to the production dataset if the record of the data blocks indicates that the data blocks have not yet been modified by writing to the production dataset.
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