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:
Jan. 10, 2006
Filed:
Apr. 29, 2004
Naoki Higashijima, Machida, JP;
Seiki Morita, Odawara, JP;
Ikuya Yagisawa, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disk array device that prevents the processing of the host device from being interrupted or delayed by drive idle seek, idle seek being executed by all the drives at approximately fixed intervals. The disk array device predicts the approach of the scheduled times to start idle seek of each of the disk drives, . . . and exercises control so that, within the same parity group, idle seek is not executed by two or more drives, . . . at the same time. Within the same parity group, one of the drives whose idle seek scheduled start time is approaching is considered in advance to be executing idle seek and hence data access is denied beforehand. When a data read request with respect to the drivethat is considered to be executing idle seek is received, the required data is recovered by reading data from all the other drives, . . . belonging to the same parity group.