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. 19, 1995
Filed:
Mar. 10, 1993
Hitachi, Ltd., Tokyo, JP;
Abstract
A read/write replica of a file in a file server is updated through a communication line by a client. At the same time, a replica server detects the update data by using a virtual communication line between the client and a read-only replica of the file. The update data are used for refreshing the read-only replica. The refreshing process makes it unnecessary to send the update data from the file server to the replica server. Also, communication is made between the file server and the replica server to confirm validity of the update information taken in by the replica server to maintain equality of the files of the file server and the replica server. This can efficiently refresh the read-only replica of the replica server in a distributed data processing system without re-sending the update data.