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. 12, 2008
Filed:
Nov. 09, 2004
Ikuo Uratani, Hadano, JP;
Kiichiro Urabe, Isehara, JP;
Dai Taninaka, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention makes it possible to change over a volume transparently with respect to a host. A first storage deviceA and a second storage deviceB are connected through a communication networkB; a volumeprovided by the second storage deviceB is mapped as a volume of the first storage deviceA. A hostis capable of accessing either of the volumeor volumevia a virtual LU. A connection control unit, which may be constructed of tables or the like, connects the virtual LUto either one of volumeand volume. Changeover of the connection target is performed transparently with respect to the hostand so is not recognized by the host. Consequently, the actual data storage target volume can be changed over while the hostalways accesses the same virtual LU