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. 09, 2026
Filed:
Sep. 09, 2024
Hitachi Vantara, Ltd., Yokohama, JP;
Tetsuaki Nukata, Tokyo, JP;
Shintaro Ito, Tokyo, JP;
Takahiro Yamamoto, Tokyo, JP;
Yoshinori Ohira, Tokyo, JP;
HITACHI VANTARA, LTD., Yokohama, JP;
Abstract
A nonvolatile storage device has a permanent area and a cache data log area. A memory has a cache data area. A processor stores data related to a write request in the cache data area, stores a log header having a sequence number and data stored in the memory in a cache data log area, responds to a write request source, registers a sequence number of the log header in an invalidation table, destages the data stored in the memory to the permanent area, creates a log header having a sequence number, registers the sequence number in the invalidation table, and when the cache data log area is collected by a garbage collection method, deletes a log header having a sequence number older than the sequence number registered in the invalidation table and corresponding data from the cache data log area to release the storage area.