The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2008
Filed:
Feb. 05, 2004
Roger Keith Stager, Livermore, CA (US);
Donald Alvin Trimmer, Livermore, CA (US);
Pawan Saxena, Pleasanton, CA (US);
Randall Johnson, Pleasant Grove, UT (US);
Craig Anthony Johnston, Livermore, CA (US);
Yafen Peggy Chang, Fremont, CA (US);
Rico Blaser, San Francisco, CA (US);
Roger Keith Stager, Livermore, CA (US);
Donald Alvin Trimmer, Livermore, CA (US);
Pawan Saxena, Pleasanton, CA (US);
Randall Johnson, Pleasant Grove, UT (US);
Craig Anthony Johnston, Livermore, CA (US);
Yafen Peggy Chang, Fremont, CA (US);
Rico Blaser, San Francisco, CA (US);
Network Appliance, Inc., Sunnyvale, CA (US);
Abstract
A method for synchronizing a secondary volume with a primary volume in a continuous data protection system begins by scanning a region of the primary volume, which is then compared with a corresponding region of the secondary volume. An identification of the scanned region is stored in a compare delta map when the comparison results in a discrepancy between the scanned region and the corresponding region. Data is copied from the primary volume to the secondary volume, using the compare delta map as a guide to locate the data to copy. If the data protection system has failed just prior to the restore process being initiated, it is termed a re-baseline, and the entire primary volume is scanned. If the data protection system is active prior to the restore process being initiated, it is termed a re-synchronization, and is optimized by scanning only select regions of the primary volume.