The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2015
Filed:
Jan. 26, 2012
Yoichi Mizuno, Chigasaki, JP;
Yoichi Mizuno, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system is provided with 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 a host computer and that is provided with a cache region. In a case that a write request specifies a secondary volume storing a snapshot of a primary volume the write data is stored in a first cache sub region of the cache region and a response to the write request is transmitted to the host computer. In the case in which a page in the pool is unallocated to a virtual region of a write destination of the write data, a page is allocated to the virtual region, and write data is stored in the first cache sub region into the allocated page.