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. 07, 1998
Filed:
May. 20, 1996
Koji Matsuda, Hitachinaka, JP;
Yoshihiro Miyazaki, Hitachi, JP;
Soichi Takaya, Hitachi, JP;
Kazuhiro Hyuga, Hitachi, JP;
Nobuo Akeura, Ebina, JP;
Shinichiro Yamaguchi, Mito, JP;
Naoto Miyazaki, Hitachi, JP;
Satoru Kayukawa, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Information & Control Systems Inc., Hitachi, JP;
Abstract
A method of verifying operation concurrence in maintenance/replacement of twin CPUs employed in a dual-CPU computer wherein a replacement CPU with an initial fault may have been installed by mistake during on-line maintenance/replacement work and a system therefor are disclosed whereby a failure which, without the method and the system, would occur due to the initial fault of the replacement CPU during a dual subsystem synchronous operation carried out thereafter by the computer can be prevented from entailing a system down on both the subsystems.