Title:
STORAGE SYSTEM AND ITS DATA PROCESSING METHOD
Document Type and Number:
WIPO Patent Application WO/2012/143980
Kind Code:
A1
Abstract:
A cache memory is utilized effectively because data redundancy elimination is executed. A controller manages the cache memory by dividing it into a first area and a second area. When receiving a write access request from an access requestor, the controller divides a data block, which is an access target, into a plurality of chunks and searches the first area first and then the storage apparatus based on each chunk. If chunk storage information, indicating that each chunk is stored in the storage apparatus, does not exist in the first area or the storage apparatus, the controller executes chunk storage processing and creates and stores the chunk storage information. If the chunk storage information exists, the controller eliminates the chunk storage processing for storing the chunks. If the chunk storage information does not exist in the first area, the controller stages the chunk storage information from the storage apparatus to the first area on condition that the first area has an unused area.
More Like This:
Inventors:
TASHIRO NAOMITSU (JP)
Application Number:
PCT/JP2011/002385
Publication Date:
October 26, 2012
Filing Date:
April 22, 2011
Export Citation:
Assignee:
HITACHI LTD (JP)
HITACHI COMP PERIPHERALS CO (JP)
TASHIRO NAOMITSU (JP)
HITACHI COMP PERIPHERALS CO (JP)
TASHIRO NAOMITSU (JP)
International Classes:
G06F12/08; G06F12/0866; G06F12/0868
Domestic Patent References:
| WO2006039493A2 | 2006-04-13 |
Foreign References:
| US20080133835A1 | 2008-06-05 | |||
| JP2002091811A | 2002-03-29 |
Attorney, Agent or Firm:
OHGA, Shinji et al. (3rd Floor Shiodome Building, 1-2-20, Kaigan, Minato-k, Tokyo 22, JP)
Download PDF:
Claims:
Previous Patent: X-RAY DIAGNOSTIC APPARATUS AND X-RAY DIAGNOSIS PROGRAM
Next Patent: WIRELESS COMMUNICATION SYSTEM
Next Patent: WIRELESS COMMUNICATION SYSTEM