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. 05, 2010
Filed:
Apr. 24, 2006
Jason Ansel Lango, Mountain View, CA (US);
Yong Eun Cho, Cambell, CA (US);
Paul Christopher Eastham, Mountain View, CA (US);
Ling Zheng, Sunnyvale, CA (US);
Stephen L. Manley, Pleasanton, CA (US);
John K. Edwards, Sunnyvale, CA (US);
Robert M. English, Menlo Park, CA (US);
Emmanuel Ackaouy, Cambridge, GB;
Jason Ansel Lango, Mountain View, CA (US);
Yong Eun Cho, Cambell, CA (US);
Paul Christopher Eastham, Mountain View, CA (US);
Ling Zheng, Sunnyvale, CA (US);
Stephen L. Manley, Pleasanton, CA (US);
John K. Edwards, Sunnyvale, CA (US);
Robert M. English, Menlo Park, CA (US);
Emmanuel Ackaouy, Cambridge, GB;
NetApp, Inc., Sunnyvale, CA (US);
Abstract
A technique is disclosed for restoring data of sparse volumes, where one or more block pointers within the file system structure are marked as ABSENT, and fetching the appropriate data from an alternate location on demand. Client data access requests to the local storage system initiate a restoration of the data from a backing store as required. A demand generator can also be used to restore the data as a background process by walking through the sparse volume and restoring the data of absent blocks. A pump module is also disclosed to regulate the access of the demand generator. Once all the data has been restored, the volume contains all data locally, and is no longer a sparse volume.