Patent ID: 7822787

Claim:
A file management method for a computer system having: one first server accessed by a client computer; a plurality of second servers coupled to the first server via a network; and a plurality of storage subsystems coupled to the second servers, the file management method comprising: providing, by the second server, as at least one file, data stored in the storage subsystem; executing, by the second server, at least one first program which performs processing related to a file group, the file group including the at least one file; integrating, by the first server, directory structures that are unique to the respective second servers to provide a directory structure that is unique throughout the computer system to the client computer; obtaining, by the first server, from the second server, a utilization state of the first program executed by the second server; judging, by the first server, from the obtained first program utilization state, whether or not migration of the file group is necessary; and instructing, by the first server, the second server to migrate the file group in a case where it is judged that the file group needs to migrate, said method further comprising: storing, by the first server, GNS definition information for indicating an association between a directory path that is unique throughout the computer system and a directory path that is unique to the respective second servers; receiving, by the first server, an access request which includes, as an access destination, a directory path that is unique throughout the computer system; converting, by the first server, directory path included in the received access request into a directory path that is unique to the respective second server based on the GNS definition information; and sending, by the first server, the access request including the converted directory path to the second server.