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1. (WO2018020593) COMPUTER SYSTEM AND DATA STORAGE METHOD

Pub. No.:    WO/2018/020593    International Application No.:    PCT/JP2016/071962
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Thu Jul 28 01:59:59 CEST 2016
IPC: G06F 12/00
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: INOUE, Shinri
井上 真理
TAKEUCHI, Hisaharu
竹内 久治
SEKI, Toshiya
関 俊哉
Title: COMPUTER SYSTEM AND DATA STORAGE METHOD
Abstract:
When a third write request requesting a write of second data not stored in a data storage area to a first logical area is received after a first write request, a processor: calculates second identification information based on the second data; writes the second data to a second physical area in the data storage area; registers the association of the address of the first logical area, the address of the second physical area, first present identification information indicating second identification information, and first old identification information indicating first identification information in conversion information; and registers the association of the second identification information and the address of the first logical area in duplicate information. When the first logical area satisfies a preset separation condition, the processor deletes the address of the first logical area from the duplicate information, and deletes the first old identification information from information, among the conversion information, that is associated with the address of the first logical area.