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Systems and methods for providing a modification history for a location within a data store

  • US 7,287,133 B2
  • Filed: 08/24/2004
  • Issued: 10/23/2007
  • Est. Priority Date: 08/24/2004
  • Status: Active Grant
First Claim
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1. A method for providing a modification history for a location within a data store, the method comprising:

  • intercepting all write requests directed to a data store on a continuous basis without scheduling any volume-level snapshot, wherein a copy-on-write operation is performed in response to each write request, thereby generating a historical index of copy-on-write operations;

    receiving-a request for a modification history for a specified location within the data store;

    determining at least one time at which at least a portion of data stored at the specified location was modified, the determination being based on the historical index of copy-on-write operations; and

    transmitting, in response to the received request, the at least one determined time.

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