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. 17, 2018
Filed:
Jun. 26, 2014
Hitachi, Ltd., Tokyo, JP;
Takahito Sato, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system is composed of a first storage subsystem and a second storage subsystem each having one or more volumes, and a third storage subsystem capable of being accessed from both the first storage subsystem and the second storage subsystem. The storage system operates to replicate the data written from the host to a volume within the first or the second storage subsystem to a volume within the second or the first storage subsystem. The first and second storage subsystems periodically write health check information to the third storage subsystem. When the first storage subsystem receives a write request from the host but cannot replicate the write data to the second storage subsystem, it reads the health check information written to the third storage subsystem to confirm that a volume of the second storage subsystem is I/O prohibited, and resumes processing regarding the write request from the host.