File-sharing system and method for processing files, and program

A file-sharing system comprising:

• a first file server (200, 1800) including a first scan processing section (290, 1810) configured to scan data included in a file to generate predetermined information, the first file server (200, 1800) being configured to provide a file to a client terminal (100) based on a virtual file system (360) that is generated by virtually merging a first file system (370, 380) and a second file system (490);
• and
• a second file server (400, 1900) including a second scan processing section (460, 1910) and the second file system (490), the second scan processing section (460, 1910) being configured to scan data included in a file to generate predetermined information, wherein:
• the first scan processing section (290, 1810), in response to a first scan processing request for files included in the first and second file systems (370, 380, 490) issued by a management terminal (110), executes scan processing to the files included in the first file system (370, 380) based on the virtual file system (360), and sends a second scan processing request to the second file server (400, 1900) to execute scan processing to the files included in the second file system (490),
• the second scan processing section (400, 1910), in response to the second scan processing request received, executes scan processing to the files included in the second file system and sends the scan processing result to the first file server (200, 1800),
• the first file server (200, 1800) merges the scan processing result obtained with the first scan processing section (290, 1810) and the scan processing result obtained with the second scan processing section (460, 1910), and provides the merged result to the management terminal (110),
• the virtual file system (360) constitutes a hierarchical file system with the first file system (370, 380) defined as an upper-level file system and the second file system (490) defined as a lower-level file system, and the first file server (200, 1800) further includes a file migration processing section (540) configured to migrate a file from the first file system (370, 380) to the second file system (490) in accordance with a predetermined condition (550),
• the first file sever (200, 1800) further includes an object management table (800) that manages a correspondence relationship between the virtual file system (360) and a storage location of a real file or directory, and a batch processing flag (860) indicating that all files included in a single directory have been migrated to the second file system (490),
• the first scan processing section (290, 1810) refers to the object management table (800) for a file and a directory corresponding to the first scan processing request, and sends the second scan processing request to the second file server (400, 1900) to execute scan processing to all files included in a directory whose batch processing flag (860) is ON, and
• the second scan processing section (460, 1910), in response to the second scan processing request received, executes scan processing to the files included in the directory whose batch processing flag is ON and sends the scan processing result to the first file server (200, 1800).

A method for processing files with a file-sharing system, the file-sharing system comprising a first file server (200, 1800) including a first file system (370, 380) and a second file server (400, 1900) including a second file system (490), wherein:

• the first file server (200, 1800) generates a virtual file system (360) by merging the first file system (370, 380) and the second file system (490), and provides a file to a client terminal (100) based on the virtual file system (360),
• the first file server (200, 1800), in response to a scan processing request for files included in the first and second file systems (370, 380, 490) issued by a management terminal (110), executes scan processing to the files included in the first file system (370, 380) based on the virtual file system (360) and sends a scan processing request to the second file server (400, 1900) to execute scan processing to the files included in the second file system (490),
• the second file server (400, 1900), in response to the scan processing request received from the first file server (200, 1800), executes scan processing to the files included in the second file system and sends the scan processing result to the first file server (200, 1800),
• the first file server (200, 1800) merges its own scan processing result and the scan processing result obtained from the second file server (400, 1900), and provides the merged result to the management terminal (110),
• the first file server is a file server (200, 1800) connected to the client terminal (100) and the management terminal (110) via a network (120), the second file server is a cloud computing environment (400, 1900) connected to the first file server (200, 1800) via a network (130), the first file system is an upper-level real file system (370, 380) provided by a disk array system (300) connected to the first file server (200, 1800),
• the second file system is a lower-level real file system (490) provided by the cloud computing environment (400, 1900),
• the virtual file system (360) constitutes a hierarchical file system with the upper-level real file system (370, 380) and the lower-level real file system (490),
• the first file server (200, 1800) performs the following processing:
• executing inter-tier migration of a file from the upper-level real file system (370, 380) to the lower-level real file system (490) in accordance with conditions described in an inter-tier migration policy (550) that is a policy for migrating files between file systems of different tier levels including the upper- and lower-level real file systems (370, 380, 490),
• updating, while executing the inter-hierarchical file migration, information of an object management table (800) that manages a correspondence relationship between the virtual file system (360) and a storage location of a real file or directory, and a batch processing flag (860) indicating that all files included in a single directory have been migrated to the lower-level real file system (490), and
• referring to the object management table (800) for a file and a directory corresponding to the scan processing request, and sending a scan processing request to the second file server (400, 1900) to execute scan processing to all files included in a directory whose batch processing flag (860) is ON, and executing by itself scan processing to files that are included in a directory whose batch processing flag is OFF and are included in the second file system (490), instead of instructing the second scan processing section (460, 1910) to execute scan processing to such files, and
• the cloud computing environment (400, 1900), in response to the scan processing request received from the first file server (200, 1800), executes scan processing to the files included in the directory whose batch processing flag is ON and sends the scan processing result to the first file server (200, 1800).