FILE MANAGEMENT SYSTEM, FILE MANAGEMENT METHOD, FILE MANAGEMENT PROGRAM

• US 20080294700A1
• Filed: 05/23/2008
• Published: 11/27/2008
• Est. Priority Date: 05/23/2007
• Status: Abandoned Application

• Current Assignee: NEC Access Technica Limited (NEC Corporation)
• Original Assignee: NEC Corporation
• Inventors: SUGIMOTO, Kinichi
• Application Number:
  US12/125,983
• Publication Number:
  US 20080294700A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/178 Techniques for file synchronisation in file systems

Abstract

A file management system and the like for alleviating the load on the hardware due to file synchronization are provided. A file management system includes a time measurement unit for recording an update history of the file; an update interval calculation unit for calculating an update interval and a blank period of the file based on the update history, and determining a synchronization time of the file based on the update interval and the blank period; and a file management unit for executing synchronization of the file stored in the plurality of storage media at the synchronization time.

Claims

1. A file management system for performing synchronization process of a file stored in a plurality of storage media, the file management system comprising:

a time measurement unit for recording an update history of the file;

an update interval calculation unit for calculating an update interval and a blank period of the file based on the update history, and determining a synchronization time of the file based on the update interval and the blank period; and

a file management unit for executing synchronization of the file stored in the plurality of storage media at the synchronization time.

2. The file management system according to claim 1, wherein the update interval calculation unit records the update interval and the blank period so as to be corresponded to file management metadata.

3. The file management system according to claim 1, wherein the update interval calculation unit sets a time after a lapse of an update interval contained in the update history from a previous synchronization time as the synchronization time.

4. The file management system according to claim 1, wherein the update interval calculation unit predicts a time when write is to be converged at a time the write to the file starts to occur, and sets the time as a next synchronization time.

5. The file management system according to claim 4, wherein the update interval calculation unit estimates a duration time which is a period from when the write to the file starts to occur until the write is converged, and predicts a time when the write is to be converged based on the duration time.

6. The file management system according to claim 1, wherein

the update interval calculation unit generates, for every synchronization time, an update directory which is a list of files to be synchronized at the relevant time;

and

the file management unit executes the synchronization on the files recorded in the update directory at an update time.

7. The file management system according to claim 1, wherein

one master server includes the time measurement unit, the update interval calculation unit, and the file management unit;

one or more slave server, connected to the master server, for managing a duplicate file of a file managed by the master server includes the time measurement unit; and

the update interval calculation unit calculates the update interval and the blank period based on the update history of the duplicate file received from the slave server.

8. The file management system according to claim 1, wherein

one master server includes the time measurement unit, and the update interval calculation unit;

one or more slave server, connected to the master server, for managing a duplicate file of a file managed by the master server includes the time measurement unit and the file management unit;

the update interval calculation unit calculates the update interval and the blank period based on the update history of the duplicate file received from the slave server; and

the file management unit receives the update time from the master server.

9. The file management system according to claim 7, wherein

the time measurement unit records the update history so as to be corresponded to identification information of the slave server which executed the update of the file;

and

an update time calculation unit calculates the update time for every slave server.

10. The file management system according to claim 7, wherein

the time measurement unit records the update history so as to be corresponded to identification information of a user who requested the update of the file or identification information of a client who transmitted a command requesting for update of the file;

and

an update time calculation unit calculates the update time for every user or for every client.

11. The file management system according to claim 1, wherein at least one of the plurality of storage media is an exchangeable storage medium.

12. A file management system for performing synchronization process of a file stored in a plurality of storage media, the file management system comprising:

a time measurement means for recording an update history of the file;

an update interval calculation means for calculating an update interval and a blank period of the file based on the update history, and determining a synchronization time of the file based on the update interval and the blank period; and

a file management means for executing synchronization of the file stored in the plurality of storage media at the synchronization time.

13. A file management method for performing synchronization process of a file stored in a plurality of storage media, the file management method comprising:

measuring a time in which a time measurement unit records an update history of the file;

calculating an update interval in which an update interval calculation unit calculates an update interval and a blank period of the file based on the update history, and determines a synchronization time of the file based on the update interval and the blank period; and

managing a file in which a file management unit executes synchronization of the file stored in the plurality of storage media at the synchronization time.

14. The file management method according to claim 13, wherein in calculating the update interval, the update interval and the blank period are recorded so as to be corresponded to file management metadata.

15. The file management method according to claim 13, wherein in calculating the update interval, a time after a lapse of an update interval contained in the update history from a previous synchronization time is set as the synchronization time.

16. The file management method according to claim 13, wherein in calculating the update interval, a time when write is to be converged is predicted at a time the write to the file starts to occur, and the time is set as a next synchronization time.

17. The file management method according to claim 16, wherein in calculating the update interval, a duration time which is a period from when the write to the file starts to occur until the write is converged is estimated, and a time when the write is to be converged is predicted based on the duration time.

18. The file management method according to claim 13, wherein

in calculating the update interval, an update directory which is a list of files to be synchronized at the relevant time is generated for every synchronization time;

and

in managing a file, the synchronization is executed on the files recorded in the update directory at an update time.

19. The file management method according to claim 13, wherein

one master server includes the time measurement unit, the update interval calculation unit, and the file management unit;

one or more slave server, connected to the master server, for managing a duplicate file of a file managed by the master server includes the time measurement unit; and

in calculating the update interval, the update interval and the blank period are calculated based on the update history of the duplicate file received from the slave server.

20. The file management method according to claim 13, wherein

one master server includes the time measurement unit, and the update interval calculation unit;

one or more slave server, connected to the master server, for managing a duplicate file of a file managed by the master server includes the time measurement unit and the file management unit;

in calculating the update interval, the update interval and the blank period are calculated based on the update history of the duplicate file received from the slave server; and

in managing a file, the update time is received from the master server.

21. The file management method according to claim 19, wherein

in measuring a time, the update history is recorded so as to be corresponded to identification information of the slave server which executed the update of the file;

and

in calculating the update interval, the update time is calculated for every slave server.

22. The file management method according to claim 19, wherein

in the time measurement step, the update history is recorded so as to be corresponded to identification information of a user who requested the update of the file or identification information of a client who transmitted a command requesting for update of the file;

and

in an update time calculation step, the update time is calculated for every user or for every client.

23. The file management method according to claim 13, wherein at least one of the plurality of storage media is an exchangeable storage medium.

24. A file management program for causing a computer to execute a synchronization process of a file stored in a plurality of storage media, the file management program causing the computer to execute:

a time measurement process of recording an update history of the file;

an update interval calculation process of calculating an update interval and a blank period of the file based on the update history, and determining a synchronization time of the file based on the update interval and the blank period; and

a file management process of executing synchronization of the file stored in the plurality of storage media at the synchronization time.

25. The file management program according to claim 24, wherein in the update interval calculation process, the update interval and the blank period are recorded so as to be corresponded to file management metadata.

26. The file management program according to claim 24, wherein in the update interval calculation process, a time elapsed from a previous synchronization time by an update interval contained in the update history is set as the synchronization time.

27. The file management program according to claim 24, wherein in the update interval calculation process, a time when write is to be converged is predicted at a time the write to the file starts to occur, and the time is set as a next synchronization time.

28. The file management program according to claim 27, wherein in the update interval calculation process, a duration time which is a period from when the write to the file starts to occur until the write is converged is estimated, and a time when the write is to be converged is predicted based on the duration time.

29. The file management program according to claim 24, wherein

in the update interval calculation process, an update directory which is a list of files to be synchronized at the relevant time is generated for every synchronization time;

and

in the file management process, the synchronization is executed on the files recorded in the update directory at an update time.