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:
Aug. 25, 2015
Filed:
Apr. 25, 2012
Takayuki Fukatani, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Keiichi Matsuzawa, Yokohama, JP;
Masaaki Iwasaki, Tachikawa, JP;
Takayuki Fukatani, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Keiichi Matsuzawa, Yokohama, JP;
Masaaki Iwasaki, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A file storage performs control to create a virtual parent file having an identifier capable of uniquely identifying a parent file among storage systems and volumes, and to acquire block layout information of the parent file using said identifier. The file storage creates a virtual parent file in the volume in which the clone file is created, and sets the file as a virtual parent file of the clone file so as to enable creation of a clone file of a parent file that exists in a different volume or a different storage system. Moreover, by combining creating the virtual parent file and switching the identifier of the parent file which is pointed by the virtual parent file, migration of clone files and parent files astride storage systems and volumes is enabled.