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:
Apr. 17, 2007
Filed:
Sep. 30, 2002
Madhav Mutalik, Southborough, MA (US);
Dennis Thomas Duprey, Raleigh, NC (US);
Robert F. Goudreau, Jr., Cary, NC (US);
Charles Christopher Bailey, Carrboro, NC (US);
Madhav Mutalik, Southborough, MA (US);
Dennis Thomas Duprey, Raleigh, NC (US);
Robert F. Goudreau, Jr., Cary, NC (US);
Charles Christopher Bailey, Carrboro, NC (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
The present invention provides a method for providing snapshots of data at different times and for performing rollbacks to a selected snapshot that does not result in any subsequent snapshots being rendered unusable. The method includes a mapping mechanism wherein when a map entry for a block being written to for the first time during a session exists, then another map entry is created and all later sessions are applied to it. When a map entry for the block does not exist, a new map entry is provided and all prior sessions are applied to it.