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1. (WO2013111193) STORAGE SYSTEM AND STORAGE CONTROL METHOD

Pub. No.:    WO/2013/111193    International Application No.:    PCT/JP2012/000507
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Fri Jan 27 00:59:59 CET 2012
IPC: G06F 3/06
G06F 12/08
Applicants: HITACHI, LTD.
MIZUNO, Yoichi
Inventors: MIZUNO, Yoichi
Title: STORAGE SYSTEM AND STORAGE CONTROL METHOD
Abstract:
A storage system is provided with a plurality of storage devices that are basis of a pool and a primary volume and a controller that is coupled to the plurality of storage devices and the host computer and that is provided with a cache region. (A) In the case in which the controller receives a write request that specifies a secondary volume that is a snapshot of a primary volume from the host computer, (a1) the controller stores the write data that is data that conforms to the write request into a first cache sub region of the cache region and (a2) the controller transmits a response to the write request to the host computer after the (a1), and (B), (b1) in the case in which a page in the pool is unallocated to a virtual region of a write destination of the write data, the controller allocates a page to the virtual region, and (b2) the controller stores the write data in the first cache sub region into the allocated page.