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1. (WO2013153584) STORAGE DEVICE

Pub. No.:    WO/2013/153584    International Application No.:    PCT/JP2012/002589
Publication Date: Fri Oct 18 01:59:59 CEST 2013 International Filing Date: Sat Apr 14 01:59:59 CEST 2012
IPC: G06F 3/06
G06F 11/14
Applicants: HITACHI, LTD.
HITACHI INFORMATION & TELECOMMUNICATION ENGINEERING, LTD.
HAYASAKA, Mitsuo
YAMASAKI, Koji
TASHIRO, Naomitsu
Inventors: HAYASAKA, Mitsuo
YAMASAKI, Koji
TASHIRO, Naomitsu
Title: STORAGE DEVICE
Abstract:
Chunks that commonly occur in each content type are aggregated in a first container. To be more specific, a storage device used for content backup is configured with: (1) a memory device that provides a memory region for one or a plurality of first containers used to store first chunks that commonly occur in each content type among chunks extracted from the contents of writing targets, and for one or a plurality of second containers used to store other chunks than the first chunks; and (2) a backup unit that decides whether each of the chunks extracted from the contents of the writing targets is a first duplication chunk duplicating a chunk stored in the first container, and further decides, for only a chunk that is decided not to be the first duplication chunk, whether each of the chunks is a second duplication chunk duplicating a chunk stored in the second container, and then stores only a chunk that is decided not to be the second duplication chunk in the second container.