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:
Apr. 17, 2007
Filed:
Jun. 08, 2004
Noboru Morishita, Yokohama, JP;
Hiroshi Arakawa, Yokohama, JP;
Seiji Kaneko, Zama, JP;
Hisao Honma, Odawara, JP;
Noboru Morishita, Yokohama, JP;
Hiroshi Arakawa, Yokohama, JP;
Seiji Kaneko, Zama, JP;
Hisao Honma, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When storage controllers are added to a storage system to change the storage system from a configuration having only one storage controller to a configuration having plural storage controllers, or when storage controllers are removed from the storage system to change the storage system from a configuration having plural storage controllers to a configuration having only one storage controller, a controller-internal management-information memory controller carries out a copy process to copy management information from each of the storage controllers to a management-information-memory switch or vice versa at the same time as processing of read and write requests for access to the management information, made by a channel interface or a disc interface, in order to change storage locations of the management information while processing the read and write requests made by the host.