Patent ID: 7386552

Claim:
A first file server in a computer system including at least a host computer and a second file sever, comprising: a migration module that reads data and attribute information of at least one file stored in the second file server; and a second module that operates to store the data and the attribute information of the at least one file read out from the second file server in the first file server without changing contents of the attribute information, wherein the migration module obtains the attribute information of a directory of the second file server using NFS command and CIFS command, and verifying whether files exist under the directory, wherein if any files exist, the migration module acquires a NFS attribute information for each of the files under the directory, and acquires a CIFS attribute information for each of the files under the directory, and wherein when the host computer reads the at least one file after the second module stored the at least one file in first file server, the at least one file stored in the first file server is read.