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:
May. 18, 1999
Filed:
Aug. 16, 1996
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
711114 ; 39518205 ;
Abstract
A disk array subsystem includes a logical volume allocation controller, which divides and reallocates data of the same logical volume LVN among a plurality of magnetic disk drive groups when a magnetic disk group is added thereto. Successful logical-volume allocation can reduce the I/O processing frequency between magnetic disk drive groups, thus achieving enhanced performance of the disk array subsystem.