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. 18, 2015
Filed:
Jan. 24, 2013
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Takaaki Yamato, Nagano, JP;
Fumio Matsuo, Nagano, JP;
Katsuo Enohara, Kawaguchi, JP;
Nobuyuki Hirashima, Nagano, JP;
Takashi Murayama, Nagano, JP;
Tetsuya Kinoshita, Nagano, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A virtual tape device includes a memory to record logical volume information that includes an identifier of a logical volume, an identifier of a physical volume that stores data of the logical volume, and information that indicates whether the data of the logical volume is cached in a cache unit, in association with each other. A determining unit that, when a copy command to copy data of the logical volume stored in a first physical volume to a second physical volume is received, determines whether a logical volume cached in the cache unit exists among the logical volumes, and a storage control unit that, when it is determined that the logical volume cached in the cache unit exists among the logical volumes, stores the data of the logical volume cached in the cache unit to the second physical volume without reference to an order indicated in the copy command.