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:
Jul. 08, 2003
Filed:
Jul. 06, 2001
Atsushi Kubo, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Each of a plurality of host devices sharing one disk device with each other includes a disk cache. When one of the host devices writes data in a cache included therein, it sends information that the data has been written in the cache, to the shared disk device and the other host devices. The shared disk device retains the sent information, while each of the other host devices erases the data of a corresponding block from its cache. When the other host device reads the data of the block, there is a cache miss, so that the other host device requests the shared disk device to transmit the data of the block. The shared-disk device transmits the block into the cache of the host device having requested the transmission of the block, based on information retained in an internal register of the shared-disk device.