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:
Mar. 05, 2019
Filed:
Apr. 22, 2014
Hitachi, Ltd., Tokyo, JP;
Yoshihiro Yoshii, Tokyo, JP;
Kazuei Hironaka, Tokyo, JP;
Akira Yamamoto, Tokyo, JP;
Norio Shimozono, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system is adapted for efficiency by defining beforehand a first size, which is the maximum data that can be read at one time, a second size, which is equal to or less than the first size, and a third size, which is a factor of the first size. A controller provides a virtual volume comprising a plurality of virtual pages. Upon receiving a write request, the controller allocates a pool area comprising a plurality of stripes of the first size, stores the write request data in a cache, and when writing the data stored in the cache to the storage device, compresses the data in accordance with the third size unit, selects a storage area in accordance with the second size unit, and writes the compressed data to the selected second size storage area sequentially from the start address of a free area without leaving spaces therebetween.