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. 09, 2014
Filed:
Apr. 12, 2013
Hitachi, Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A controller receives new data which is data updated from old data, stores the received new data in a memory, reads the old data from a first storage medium group and stores the old data read into the memory, generates transfer data which is used to replicate in the subsidiary storage system new data with less information than the new data on the basis of a difference between the old data and the new data in the memory and transmits the transfer data to the subsidiary storage system, reads the old parity and stores it in the memory, and generates new parity which is parity updated from the old parity on the basis of the old parity in the memory and XOR data which is the exclusive logical sum of the new data and old data in the memory, and stores the new parity in the first storage medium group.