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:
Aug. 15, 2000
Filed:
Dec. 23, 1997
Yoshiaki Mori, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A disk cache is controlled to continue duel data writing even during a degenerated mode of operation due to a failure of a cache memory, and also to continue a FAST WRITE process while maintaining reliability for thereby avoiding a drop in performance. If a memory module MM#1 fails, processing of dirty data 111 stored in the memory module MM#1 is continued using backup data 122 stored in a memory module MM#2 for the dirty data 111 stored in the memory module MM#1. The backup data 122 stored in the memory module MM#2 for the dirty data 111 stored in the memory module MM#1 is copied to a memory module MM#3, generating backup data 111' for the dirty data 111. Then, dirty data 131 stored in the memory module MM#3 is copied to the memory module MM#2, generating backup data 112' for the dirty data 131 stored in the memory module MM#3, instead of backup data 112 stored in the memory module MM#1.