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:
Sep. 22, 2009
Filed:
Sep. 06, 2005
Yuzuru Maya, Sagamihara, JP;
Takaaki Haruna, Tokyo, JP;
Yuzuru Maya, Sagamihara, JP;
Takaaki Haruna, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of this invention is to speed up file access and shorten the switching time upon failure. There is provided a computer system with plural storage systems and plural servers, in which: the storage systems each have a disk drive for storing files read/written by the servers and a storage control device, which has an interface connected to the servers via a network and a controller for controlling file read/write in the disk drive; the storage control device and the servers each have a cache memory, which temporarily stores files read/written by the servers, and a file cache control information unit, which keeps information of files stored in the cache memory; and the file cache control information unit holds information indicating whether or not a file is stored in the cache memory of the storage control device and/or the cache memories of the servers.