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. 18, 2006
Filed:
Sep. 17, 1997
Yoshio Kitamura, Yokohama, JP;
Yoshio Kitamura, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A RAID apparatus and an access control method thereof includes same logical volumes allocated to a plurality of physical disk units. The RAID apparatus includes a plurality of physical disk units storing same logical volumes, and a disk controller accesses a particular logical volume by accessing any physical disk unit which stores the particular logical volume. The disk controller includes a memory storing the number of operations requested of each physical disk unit, for each physical disk unit, and a control circuit accessing one of the plurality of physical disk units which stores the particular logical volume, in accordance with the number of operations. Since a physical disk unit is selected in accordance with the numbers of operations of the individual physical disk units, balanced access to the physical disk units is accomplished.