公开(公告)号：US20180322024A1

公开(公告)日：2018-11-08

申请号：US15749014

申请日：2015-07-31

Applicant: HITACHI, LTD.

Inventor： Takashi NAGAO ,  Sadahiro SUGIMOTO ,  Tomohiro KAWAGUCHI ,  Norio SIMOZONO

IPC: G06F11/20 ,  G06F11/16 ,  G06F12/0871 ,  G06F3/06

Abstract: A storage system capable of dynamically securing free space when a certain storage apparatus is disused and reducing the influence on the system upon dynamically securing the free space without having to continuously secure, in a memory of another storage apparatus, free space capable of storing management information of the corresponding storage apparatus in preparation of a case where such storage apparatus is disused. Each storage apparatus comprises a memory including a management information storage area for storing management information and a cache area for storing cache information, and a processor which manages a status of the cache area. At least certain processors determine a storage apparatus to become a copy destination of the copy target management information. The storage apparatus of the copy destination releases at least a part of the cache area and stores the management information in the released cache area.