Patent ID: 6385624
Filing Date: 2002-05-07
Classification: G06F,Y10S

Abstract:
A control method for use with a network file system in which a plurality of nodes of computers share a file over a network, each of the plurality of nodes storing at least a portion of the file in a buffer, said method comprising:storing, when a file update is made by any one of the plurality of nodes, the updated data in the buffer in the node until consistency about the updated data is needed by a program that runs on the node; making a notification of the file update to the other nodes when a consistency about the updated data is needed by the program; checking, when the notification is made, whether or not data stored in the buffers in the other nodes corresponds with old data to be updated; and making, if the data corresponding with the old data to be updated is found by the checking, the corresponding data in the other nodes invalid.