FILE REPLICATION SYSTEM AND FILE REPLICATION CONTROL METHOD AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a file replication system in which the applicable range of file replication is increased by adding coherent guarantee control. SOLUTION: An IO request intercept means 2 requests a token control means 3 to permit access to a shared file 6 in response to an access request to the shared file 6. The token control means 3 notifies the IO request intercept means 2 of a node which holds update permission when the other node already holds update permission to the shared file in response to the access permission request from the IO request intercept means 2. The IO request intercept means request the reported node to process the access when the access permission is not available.