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. 04, 2019
Filed:
Oct. 09, 2014
Hitachi, Ltd., Tokyo, JP;
Atsushi Kawamura, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A storage apparatus includes a first storage device and a second storage device, out of logical-physical translation information which associates a logical page and a physical page in the second storage device with each other. Non-compressed logical-physical translation information in the first storage device is assumed to constitute a first tier, compressed logical-physical translation information in the first storage device is assumed to constitute a second tier, and compressed logical-physical translation information in the second storage device is assumed to constitute a third tier. The storage apparatus includes tier management information for managing which logical page is included in logical-physical translation information of which of the first tier, the second tier, and the third tier. When receiving an I/O with respect to the logical page, the storage apparatus retrieves the logical-physical translation information including the logical page for which the I/O has been received, based on the tier management information.