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:
Jul. 07, 2015
Filed:
Feb. 10, 2012
Mika Teranishi, Ninomiya, JP;
Hiroji Shibuya, Odawara, JP;
Shunji Murayama, Hiratsuka, JP;
Toshio Kimura, Odawara, JP;
Kazushige Nagamatsu, Odawara, JP;
Mika Teranishi, Ninomiya, JP;
Hiroji Shibuya, Odawara, JP;
Shunji Murayama, Hiratsuka, JP;
Toshio Kimura, Odawara, JP;
Kazushige Nagamatsu, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system is migrated without stopping service provision by a host computer. By this means, in a migration-source storage system, data of the cache memory is destaged, and, next, data received from the host computer is directly written in a logical unit by bypassing the cache memory. On the other hand, in a migration-destination storage system, communication with the migration-source storage system is performed to set setting information of a logical unit of the migration object into a logical unit management table and set a writing mode for the cache memory to a cache-bypass mode. After that, the migration-source storage system blocks a path to the host computer. The migration-destination storage system receives a report of the path block from the migration-source storage system and then opens a path between the own system and the host computer.