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1. (WO2017199424) COMPUTER SYSTEM

Pub. No.:    WO/2017/199424    International Application No.:    PCT/JP2016/065012
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Sat May 21 01:59:59 CEST 2016
IPC: G06F 3/06
G06F 11/20
Applicants: HITACHI, LTD.
Inventors: MIYATAKE, Kazushi
宮武 一志
KADOIRI, Satoshi
角入 聡
OKUMURA, Takeshi
奥村 健志
南竹 俊介
A computer system according to an embodiment comprises a storage system having a first storage device and a second storage device and also comprises a host and a management computer. Each of the first and second storage devices has one or more volumes accessible to the host, and compresses write data that is written to the one or more volumes. The storage system manages a first volume of the first storage device and a second volume of the second storage device as a volume pair, and stores, in both the first volume and the second volume, data requested by the host to be written to the volume pair. The computer system adjusts the amount of data stored in a compressed state in the volume pair, so that the volume pair provides a service level at least equal to a required service level set for the volume pair.