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. 06, 2009
Filed:
Dec. 16, 2005
Jun Matsuda, Odawara, JP;
Mikio Fukuoka, Odawara, JP;
Keishi Tamura, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a storage control system that can prevent capacity in a cache memory from being overloaded even when the access performance of a controller in a storage controller to an external storage device in an external storage controller is permanently or temporarily poor. In the storage control system, a first storage controller is connected to a storage device in a second storage controller and the first storage controller is configured to be able to write/read data to/from the storage device in the second storage controller in response to a request from a host device connected to the first storage controller. The first storage controller includes a controller for controlling data transmission and reception between the host device and the storage device in the second storage controller, and a cache memory for temporarily storing the data, and the controller sets a threshold value for storage capacity in the cache memory assigned to the storage device according to the properties of the storage device.