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. 20, 2000
Filed:
Nov. 26, 1997
Sawao Iwatani, Kawasaki, JP;
Suijin Taketa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a device array system, a failure alternate device is fetched from another logic group of a higher redundancy without needing a hot spare patrol, accordingly recovering redundancy of data. In a case corresponding to a mirrored device of RAID-1, as a logic group of a device array unit, a construction control unit constructs a first logic group in which the same data is stored into (N=2) devices and duplicated and a second logic group in which the same data is stored into (N+1=3) devices and triplicated. when one device has failed in the first logic group having a lower redundancy and the redundancy is lost, a failure processing unit fetches one device from the second logic group of a higher redundancy into the first logic group and reconstructs data by using the fetched device as a failure alternate device, accordingly recovering the redundancy of the first logic group.