A system comprising: a first server, coupled to a first storage apparatus, which implements a first file system in which a hierarchic structure of directories is configured; a host computer coupled to the first server; and a second server, which implements a second file system and is coupled to the first file server, wherein the first server is configured to: receive an access request from the host computer to a directory or a file of the first file system; store data of the directories and the files in the first storage apparatus; and replicate the directories and the files which are stored in the first storage apparatus to the second server; wherein, when the first file system recovers from a failure, the first server is configured to: reconfigure a predetermined part of the hierarchic structure of the first file system by obtaining metadata or entity data, which are replicated from the first server and exist in the predetermined part of the hierarchic structure, from the second server; and start receiving access request from the host computer after reconfiguration of the predetermined part of the hierarchic structure of directories, and wherein, when the first server receives an access request to a first file, which has not been restored to the first file system from the second file system, from the host computer designating a file path of the first file, which includes information of directory including the first file, and name of the first file, the first server is configured to: request the second server for metadata of directory and/or file for processing the access request to the first file; obtain the metadata of directory and/or file from the second server; reconfigure a part of the hierarchic structure of directories of the first file system based on the obtained metadata; and respond to the request for the first file using the obtained metadata. a first server, coupled to a first storage apparatus, which implements a first file system in which a hierarchic structure of directories is configured; a host computer coupled to the first server; and a second server, which implements a second file system and is coupled to the first file server, wherein the first server is configured to: receive an access request from the host computer to a directory or a file of the first file system; store data of the directories and the files in the first storage apparatus; and replicate the directories and the files which are stored in the first storage apparatus to the second server; receive an access request from the host computer to a directory or a file of the first file system; store data of the directories and the files in the first storage apparatus; and replicate the directories and the files which are stored in the first storage apparatus to the second server; wherein, when the first file system recovers from a failure, the first server is configured to: reconfigure a predetermined part of the hierarchic structure of the first file system by obtaining metadata or entity data, which are replicated from the first server and exist in the predetermined part of the hierarchic structure, from the second server; and start receiving access request from the host computer after reconfiguration of the predetermined part of the hierarchic structure of directories, and reconfigure a predetermined part of the hierarchic structure of the first file system by obtaining metadata or entity data, which are replicated from the first server and exist in the predetermined part of the hierarchic structure, from the second server; and start receiving access request from the host computer after reconfiguration of the predetermined part of the hierarchic structure of directories, and wherein, when the first server receives an access request to a first file, which has not been restored to the first file system from the second file system, from the host computer designating a file path of the first file, which includes information of directory including the first file, and name of the first file, the first server is configured to: request the second server for metadata of directory and/or file for processing the access request to the first file; obtain the metadata of directory and/or file from the second server; reconfigure a part of the hierarchic structure of directories of the first file system based on the obtained metadata; and respond to the request for the first file using the obtained metadata. request the second server for metadata of directory and/or file for processing the access request to the first file; obtain the metadata of directory and/or file from the second server; reconfigure a part of the hierarchic structure of directories of the first file system based on the obtained metadata; and respond to the request for the first file using the obtained metadata.