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:
Sep. 20, 2011
Filed:
Jan. 30, 2008
Sumihiro Miura, Yokohama, JP;
Sumihiro Miura, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage apparatus sets up part of non-volatile cache memory as a cache-resident area, and in an emergency such as an unexpected power shutdown, backs up dirty data of data cached in volatile memory to an area other than the cache-resident area in the non-volatile cache memory, together with the relevant cache management information. Further, the storage apparatus monitors the amount of the dirty data in the volatile cache memory so that the dirty data cached in the volatile cache memory is reliably contained in a backup area in the non-volatile memory, and when the dirty data amount exceeds a predetermined threshold value, the storage apparatus releases the cache-resident area to serve as the backup area.