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. 01, 2020
Filed:
Sep. 20, 2016
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Chen Gong, Beijing, CN;
Junping Frank Zhao, Beijing, CN;
Lester Ming Zhang, Beijing, CN;
Joe Jian Liu, Beijing, CN;
Denny Dengyu Wang, Beijing, CN;
Walter Lei Wang, Shanghai, CN;
EMC IP Holding Company, LLC, Hopkinton, MA (US);
Abstract
A method, apparatus, and computer program product for reclaiming one or more chunks in a snapshot storage space, are disclosed. The method comprises detecting one or more unused chunks in the snapshot storage space in response to a predefined trigger event, and reclaiming one or more detected unused chunks by providing the one or more detected unused chunks to a storage pool for reuse. One or more unused chunks may be detected by scanning a first mapping table that records a storage state of a plurality of chunks in the snapshot storage space, and a determination made whether the one or more detected unused chunks have been reclaimed. If the one or more detected unused chunks have not been reclaimed, the one or more detected unused chunks may be provided to the storage pool and a second mapping table updated to record a reclaiming state of the one or more unused chunks. A new snapshot may be stored using a chunk in the snapshot storage space that has not been used and has not been reclaimed yet.