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:
Jun. 16, 2015
Filed:
Feb. 28, 2012
Min Fang, Shanghai, CN;
Hui X. Gu, Shanghai, CN;
Xiao Yan LI, Shanghai, CN;
Fan G. Zeng, Shanghai, CN;
Min Fang, Shanghai, CN;
Hui X. Gu, Shanghai, CN;
Xiao Yan Li, Shanghai, CN;
Fan G. Zeng, Shanghai, CN;
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
The invention relates to retrieving data from a storage system. One embodiment of the invention comprises receiving a write operation, establishing a correspondence relationship between a logic block address and a physical block address of the write operation, and determining whether a valid data percentage in a mapping table is greater than a predetermined threshold after the correspondence relationship is added in stored metadata. In response to the valid data percentage being less than the predetermined threshold, the embodiment adds the correspondence relationship to a B-tree data structure of stored metadata.