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:
Jun. 03, 2008
Filed:
Jan. 04, 2005
Sumihiro Miura, Yokohama, JP;
Sumihiro Miura, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disk array subsystem makes a diagnosis of a memory device while maintaining performance of a normal access to the memory device contained in a controller, thus enhancing reliability of the memory data. In the disk array subsystem having a disk drive and a controller, the controller has a cache unit and the cache unit has a memory device and a memory control unit. The memory control unit monitors status of memory access by means of a memory access state monitoring unit, issues a diagnosis request while normal access is not made to the memory device, makes access to the memory device for diagnosis of the memory data, and checks the data read from the memory device by using ECC and detects a data error.