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:
Oct. 25, 2011
Filed:
Jan. 03, 2006
David Meiri, Cambridge, MA (US);
Magnus Bjornsson, West Newton, MA (US);
David Meiri, Cambridge, MA (US);
Magnus Bjornsson, West Newton, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Providing continuous backup of a storage device includes subdividing the storage device into subsections, providing a time indicator that is modified periodically, and, in response to a request to write new data to a particular subsection of the storage device at a particular time, maintaining data being overwritten by the new data according to the particular subsection and according to a value of the indicator at the particular time. The subsections may be tracks. Maintaining the data being overwritten may include constructing a linked list of portions of data for each of the subsections. The portions of data may have variable sizes. In response to two data write operations to a particular subsection at a particular value of the indicator, data being written for each of the two data write operations may be combined if data for the second data write operation is a subset of data for the first data write operation. Providing continuous backup of a storage device may also include restoring the storage device to a state thereof at a particular point in time by writing the maintained data to the storage device. Writing the maintained data to the storage device may include constructing subsections of the data by combining separate portions thereof corresponding to the same subsection.