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:
Jul. 02, 2024
Filed:
Sep. 09, 2021
Hitachi, Ltd., Tokyo, JP;
Kazumasa Matsubara, Tokyo, JP;
Mitsuo Hayasaka, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
Provided is a storage system capable of properly deleting derivative data stored at a plurality of sites. A CPU executes a creation process of creating data based on data stored in a storage device at a local site and storing the created data in the storage device of a node at one of the plurality of sites. Further, the CPU collects, from each of the plurality of sites, history information created at each of the plurality of sites to indicate the history of each creation process. When deleting deletion-specified data, the CPU identifies deletion derivative data according to the history information created at each of the plurality of sites, and deletes the deletion-specified data and the deletion derivative data from the storage device at each of the plurality of sites. The deletion derivative data is derivative data derived from the deletion-specified data.