JP2010231656A - File management device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate a backup each time a file is changed without exerting an adverse influence on other users, and to retrieve the generated backup file at high speed to restore the file at an optional point of time. <P>SOLUTION: The backup processing part 6 of a file management device 3 receives operation information showing the type and update time of a file operation in a file server 2 and the target file name of the operation, and writes a backup file obtained by duplicating the file of the target file name in a backup storage part 4 with a file name obtained by adding information indicating the backup file and a slave number to the target file name in preparing the file or detecting overwriting. Further, the backup processing part 6 associates the update time and the target file name with a backup file name and writes them in a backup management table in a table storage part 5. A file restoring part 7 retrieves the backup management table on the basis of a restoration time, and specifies the backup file name. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a file management apparatus that generates and manages a backup file.

  Conventionally, a snapshot function or the like has been used to generate a backup of a file. In this method, a snapshot command is executed at a predetermined timing or at a timing input by an administrator to generate a backup of a version-managed file. On the other hand, Patent Document 1 describes that a command related to file access is analyzed, and when a file is updated, a version-controlled backup file is automatically generated.

JP 2006-350829 A

When version management is performed using the above-described snapshot function, a backup is not necessarily generated at the file update timing, and thus a backup of a necessary file may not necessarily be generated. In addition, in the snapshot, information on the entire storage is rewritten, which may affect other users.
On the other hand, in Patent Document 1, when a file is updated, a version-controlled backup can be automatically generated, and the information of the entire storage is not rewritten. However, in Patent Document 1, since the backup of the file name is generated by adding the version number and the backup creation date and time to the name of the original file, the search takes time when the number of backup files increases. There was a problem that.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to generate a backup every time a file is changed without affecting other users, and to search the backup file at high speed to obtain an arbitrary point in time. An object of the present invention is to provide a file management apparatus capable of restoring files.

  In order to solve the above problems, the present invention provides a backup storage unit that stores a backup file, a table storage unit that stores a backup management table that manages the backup file, a type of file operation, a file update time, and a file Receiving the operation information indicating the target file name including the folder name of the operation target file and detecting the creation or overwriting of the file based on the operation information; When an overwriting is detected, a backup file that is a duplicate of the file with the target file name indicated by the operation information is obtained by adding the information indicating that it is a backup file and a child number to the target file name. Backup file to be written to the backup storage unit The information that associates the update unit, the update time and the target file name set in the operation information, and the backup file name that is the file name of the backup file generated by the backup generation unit is stored in the backup storage unit And a table updating unit for writing to the backup management table.

  Further, the present invention is the file management apparatus described above, wherein the detection unit detects deletion of a file based on the received operation information, and the backup file generation unit is configured to detect file deletion by the detection unit, A dummy file for deletion having a file name in which information indicating deletion of a file and a child number is added to the target file name indicated by the operation information is written in the backup storage unit, and the table update unit is set in the operation information Information that associates the update time and the target file name that has been created with the file name of the dummy file for deletion generated by the backup generation unit into the backup management table stored in the backup storage unit. Features.

  The present invention is the file management apparatus described above, wherein the detection unit detects a change in file name based on the received operation information, and the backup file generation unit detects a change in file name by the detection unit. In this case, a dummy file for deleting a file name in which information indicating deletion of a file and a child number is added to the file name before change indicated by the operation information is written to the backup storage unit and indicated by the operation information. A backup file obtained by copying the file with the changed file name to be written, the information indicating that the file is a backup file and a child number are written to the backup storage unit by the file name added to the changed file name, and the table update unit is Indicates the update time set in the operation information and the file name before change Information that associates the file name of the file with the file name of the deletion dummy file generated by the backup generation unit into the backup management table, the update time set in the operation information, and the changed file Information that associates a target file name indicating a name with a backup file name of a backup file generated by the backup generation unit is written in the backup management table.

  Further, the present invention is the file management apparatus described above, which receives information on a recovery target time from a user terminal, and specifies a backup file name whose update time is before the recovery target time from the backup management table as a restoration target If the specified restore target includes a backup file name corresponding to the same target file name, only the backup file name with the update time closest to the recovery target time is set as the restore target, and the backup file to be restored A search unit for reading a target file name corresponding to a name, and generating a file with the target file name read by the search unit corresponding to the backup file name to be restored in a file recovery area. When an output instruction for a file generated in Characterized by further comprising a restoration unit for the backup file elephant file backup file name of the recovery target that corresponds to the name read out and output from the backup storage unit.

  Further, the present invention is the file management apparatus described above, wherein the restoration unit reads a file with the target file name read corresponding to the backup file name to be restored into a file recovery area corresponding to the user. It is characterized by generating.

  The present invention is the file management apparatus described above, wherein the search unit includes a deletion dummy file corresponding to the same target file name as the target file name corresponding to the backup file name to be restored in the backup management table. File name is registered, and the update time corresponding to the file name of the deletion dummy file is after the update time corresponding to the backup file name to be restored and before the file recovery target time In this case, the backup file name is excluded from the restoration target.

  The present invention is the file management apparatus described above, wherein the table storage unit further stores a folder name change management table for managing the changed folder name, and the operation information includes a type of folder operation and a folder name. An update time and an operation target folder name are indicated, and the detection unit detects a change in the folder name based on the received operation information, and the backup file generation unit detects a change in the folder name by the detection unit In addition, the folder name change dummy file of the folder name including the folder name change time, the folder name before change and the folder name after change indicated by the operation information is written to the backup storage unit, and the search unit further includes the Reads the update time corresponding to the backup file name to be restored, and after and before the read update time Corresponding to the folder name change time before the restoration target time, if the folder name included in the backup file name to be restored is registered in the folder name change management table as the folder name before modification, the folder name before modification And the restoration unit uses the search unit to retrieve the folder name before change in the target file name read by the search unit corresponding to the backup file name to be restored. When the file with the file name replaced with the file name is generated in the file recovery area and the output instruction of the file generated in the file recovery area is received, the backup file with the backup file name to be restored is received from the backup storage unit. It reads out and outputs.

  The present invention is the file management apparatus described above, wherein the backup generation unit reads the folder name before change and the folder name change time from the folder name change management table, and the update time is before the folder name change time. And, for the backup file corresponding to the same target file name, the backup file with the file generation time closest to the folder name change time is extracted from the backup file with the backup file name including the pre-change folder name, and From this extracted backup file, there is a dummy file for deletion that is generated corresponding to the same target file name as the backup file, and whose file generation time is after the file generation time of the backup file and before the folder name change time. Do Exclude the backup file, duplicate the remaining backup file, replace the pre-change folder name in the backup file name of the backup file with the post-change folder name, and give a new child number To the backup storage unit, and further generate a deletion dummy file of the target file corresponding to the excluded backup file that is excluded and write it to the backup storage unit, the table management unit, the backup generation unit When writing the backup file name of the backup file written in the backup storage unit, the target file name acquired from the backup file name, and the folder name change time in the backup management table In addition, the backup management table stores information associating the file name of the dummy file for deletion written to the backup storage unit by the backup generation unit, the target file name acquired from the file name, and the folder name change time. It is characterized by writing in.

  The present invention is the file management apparatus described above, wherein the backup file name of the backup file stored in the backup storage unit, the target file name acquired from the backup file name, the creation time of the backup file, And a table recovery unit that generates a backup management table including information associated with.

  The present invention is the file management apparatus described above, wherein the operation information indicates a type of folder operation and a folder name to be operated, and the detection unit detects a change of the folder name based on the received operation information. The backup file generation unit, when the change of the folder name is detected by the detection unit, a folder name change dummy file including the pre-change folder name and the post-change folder name indicated by the operation information. The table restoration unit stores the folder name before and after the change indicated by the folder name change dummy file stored in the backup storage unit, the creation time of the folder name change dummy file, A folder name change management table including information associated with is generated.

  The present invention is also the file management apparatus described above, wherein the backup storage unit stores the backup file using a deduplication technique.

  According to the present invention, each time a file is changed, a backup of the file is generated and a management table of the generated backup file is generated. As a result, the user can quickly search for a backup file at a desired time and restore the file that existed at that time. At this time, since the user can restore the file to his / her own folder, it does not affect other users. It is also possible to restore deleted files. In addition, when a failure occurs in the backup file management table, the table can be restored.

It is a figure which shows the operation | movement outline | summary of the file management system by 1st embodiment of this invention. It is a block diagram of the file management system by the embodiment. It is a figure which shows the example of a data structure of the backup management table by the same embodiment. It is a figure which shows the data structural example of the folder name change management table by the embodiment. It is a figure explaining the detection process of the backup timing by the embodiment. It is a figure explaining other detection processing of backup timing by the embodiment. It is a figure explaining the process at the time of the file generation in the file management system by the embodiment. It is a figure explaining the process at the time of file overwriting in the file management system by the embodiment. It is a figure explaining the process at the time of the file deletion in the file management system by the embodiment. It is a figure explaining the process at the time of the file name change in the file management system by the embodiment. It is a figure explaining the provisional coping process at the time of folder name change in the file management system by the embodiment. It is a figure explaining the permanent coping process at the time of folder name change in the file management system by the embodiment. It is a figure explaining the file restoration process in the file management system by the embodiment. It is a figure explaining the file restoration process in the file management system by the embodiment. It is a figure explaining the search crawl process in the file management system by the embodiment. It is a figure explaining the recovery processing of the backup management table and backup management table in the file management system by the embodiment. It is a figure which shows the example of a user interface in the file management system by the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an outline of operation of a file management system according to an embodiment of the present invention.
First, the user accesses the file server from his / her terminal, and when “January 1st 12:00”, the file “Sample.txt” of the description content “a” is stored under the folder “/ PUBLIC” of the file server. ”Is newly created. After that, when “January 2 12:00”, the file “Sample.txt” is overwritten and saved in the description content b, and then “January 3 12:00” Then, it is assumed that the file “Sample.txt” is overwritten and saved with the description content c.

  In the file management system of the present embodiment, the file access status from the user is acquired, the creation or overwriting of the file as described above is recognized, the file is automatically backed up in another area, and the backup file Generate a management table. This management table is used to search for backup files and to retrieve past files at any time.

  For example, as of January 4, there is a file “Sample.txt” of the description content c overwritten at the time of “January 3, 12:00” under the folder “/ PUBLIC”. Even if “/PUBLIC/Sample.txt” is specified, the description contents a and the description contents b cannot be extracted. Therefore, the user creates a folder with a folder name “/ 01 — 02 — 1500” representing the date and time “January 12 15:00” to be restored under the folder in the file restoration area of the user. As a result, the file management apparatus generates the file in the file server that existed as of “January 12, 15:00”, that is, “/PUBLIC/Sample.txt” of the description content b, in the generated folder. Restore to "/ BACKUP / 01_02_1500".

  FIG. 2 is a configuration diagram of a file management system according to an embodiment of the present invention, in which only functional blocks related to the present invention are extracted and shown. In the figure, the file management system is configured by connecting a user terminal 1, a file server 2, and a file management apparatus 3 via a network N using IP (Internet Protocol) or the like.

  The file server 2 transmits and receives data via the network N, and includes a storage unit 21 and a file operation unit 22. In response to an instruction from the user terminal 1 such as a personal computer, the file operation unit 22 performs operations such as creating, overwriting, deleting, and renaming files and folders in the storage unit 21.

  The file management device 3 transmits and receives data via the network N, and includes a backup storage unit 4, a table storage unit 5, a backup processing unit 6, a file restoration unit 7, and a table restoration unit 8.

  The backup storage unit 4 can be realized by a database server, for example. The backup storage unit 4 has a backup file storage area, and stores the backup file generated by the backup processing unit 6 in this backup file storage area.

  The table storage unit 5 can be realized by, for example, a database server, and stores a backup management table for managing backup files and a folder name change management table for managing folders whose names have been changed.

  The backup processing unit 6 can be realized by, for example, one or a plurality of servers, and includes a detection unit 61, a backup file generation unit 62, and a table update unit 63. The detection unit 61 detects an operation for generating a backup file, specifically, creation, overwriting or deletion of a file in the file server 2, or change of a file name or a folder name. The backup file generation unit 62 generates a backup file of a file to be created, overwritten, or renamed, or generates a dummy file indicating that the file has been deleted. Further, the backup file generation unit 62 generates a dummy file used for registering the management information of the folder whose name has been changed in the folder name change management table. The table update unit 63 updates the backup management table and the folder name change management table.

  The file restoration unit 7 can be realized by, for example, one or a plurality of servers, and includes a search unit 71, a restoration unit 72, a search portal unit 73, and a search engine unit 74. The search unit 71 refers to the backup management table and the folder name change management table stored in the table storage unit 5 and searches for backup files that existed at the date and time specified by the user. Based on the backup file searched by the search unit 71, the restore unit 72 restores the file that existed at the time specified by the user. The search portal unit 73 provides the user terminal 1 with a file search portal function. The search engine unit 74 executes an application of an existing general file search engine and executes a file search process for a backup file.

  The table restoration unit 8 can be realized by, for example, one or a plurality of servers, and based on the backup file or dummy file stored in the backup storage unit 4, the backup management table and the folder name change management Restore the table.

  In addition, each part of the file management apparatus 3 may be implement | achieved by a different server, and arbitrary each part may be implement | achieved on the same server. Further, all or part of the functions of the file management device 3 may be provided in the file server 2. For example, the storage unit 21, the backup storage unit 4, and the table storage unit 5 in the file server 2 may be realized by the same storage device such as a database server. In the following, a case where a file restoration area in which a folder for file restoration is created is created in the backup storage unit 4 will be described as an example. However, it is created in a storage device such as the storage unit 21 or another database server. But you can.

  FIG. 3 is a diagram illustrating a data configuration example of the backup management table. In the figure, the backup management table includes a management ID that uniquely identifies a record, a file update time when a file is created, overwritten, deleted, renamed, etc., and the file that is the target of the operation. The target file name indicating the file name, the IP address of the user terminal 1 that performed the file operation, the login user indicating the login name used when the user terminal 1 performed the file operation, and the backup file or dummy Consists of a plurality of records including a backup file name indicating the file name of the file. Note that the IP address and user items are optional items and need not be set. The target file name includes a directory in which the file to be updated exists, that is, an absolute path name that is a folder name indicated by a hierarchical structure. The file name of the backup file also includes the folder name, but here, only the folder name downstream from the folder in the backup area is set.

  FIG. 4 is a diagram illustrating a data configuration example of the folder name change management table. In the figure, the folder name change management table includes a management ID for uniquely identifying a record, a folder name change time, a folder name before change, an IP address of the user terminal 1 that changed the folder name, and the user. The terminal 1 includes a plurality of records including a login user indicating a login name used when the folder name is changed, and the changed folder name. Note that the IP address and user items are optional items and need not be set.

5 and 6 are diagrams for explaining the backup timing detection process.
FIG. 5 is a diagram for explaining the detection of the backup timing using the log generated by the file server 2.
In the figure, the detection unit 61 of the backup processing unit 6 detects creation, overwriting and deletion of a file, and change of a file name or folder name from a log generated and output by the file server 2. That is, when the user inputs a file or folder operation instruction to the user terminal 1, the operation instruction is transmitted to the file server 2 (step S11). The file operation unit 22 of the file server 2 creates, overwrites, deletes, or renames a file or folder according to an operation instruction received from the user terminal 1. The file operation unit 22 outputs a log describing file and folder operations to the file management apparatus 3 in real time (step S12).

  The log output from the file server 2 is used by the type of operation of the file or folder, the file or folder to be operated, the IP address of the user terminal 1 that has transmitted the operation instruction, and the user terminal 1. Login name information is set. If the operation is file creation, overwriting, or deletion, the file name of the created, overwritten, or deleted file is set as the operation target file. If the operation is a file name change, the file name before the name change and the file name after the name change are set as the operation target file. If the operation is a folder name change, the folder name before the name change and the folder name after the name change are set as the operation target folder.

  When the detection unit 61 of the backup processing unit 6 detects a file creation, overwriting or deletion, or a file name change or a folder name change from the log received from the file server 2 (step S13), a backup file is generated. The unit 62 generates a backup file based on information such as the operation target file and the operation target folder acquired from the log and writes the backup file in the backup storage area of the backup storage unit 4 (step S14), and the table update unit 63 stores the table. The backup management table and folder name change management table stored in the unit 5 are updated (step S15).

FIG. 6 is a diagram for explaining the detection of the backup timing using the captured packet addressed to the file server 2.
In the figure, a packet capture device 9 is installed on a network N. When a user inputs a file or folder operation instruction to the user terminal 1, a packet in which the operation instruction is set is transmitted to the file server 2 (step S21). The packet capture device 9 duplicates the packet transmitted from the user terminal 1 to the file server 2 and transmits it to the backup processing unit 6 (step S22). The packet addressed to the file server 2 is directly transmitted to the file server 2 after copying, and the file operation unit 22 creates, overwrites, deletes, or renames the file or folder according to the received operation instruction.

  The detection unit 61 of the backup processing unit 6 receives the packet addressed to the file server 2 copied from the packet capture device 9. For the operation instruction set in the copied packet, the type of operation of the file or folder, the file or folder to be operated, the IP address of the user terminal 1 that transmitted the operation instruction, and the user terminal 1 are used. The login name information is set. If the operation is file creation, overwriting, or deletion, the file name of the created, overwritten, or deleted file is set as the operation target file. If the operation is a file name change, the file name before the name change and the file name after the name change are set as the operation target file. If the operation is a folder name change, the folder name before the name change and the folder name after the name change are set as the operation target folder.

  When the detection unit 61 of the backup processing unit 6 detects creation, overwriting or deletion of a file, change of a file name, or change of a folder name from an operation instruction included in the copied packet addressed to the file server 2 ( In step S23), the backup file generation unit 62 generates a backup file based on the information on the operation target file and the operation target folder acquired from the packet, and writes the backup file in the backup storage area of the backup storage unit 4 (step S24). The table update unit 63 updates the backup management table and folder name change management table stored in the table storage unit 5 (step S25).

  Next, the operation of the file management apparatus will be described.

FIG. 7 is a diagram for explaining processing at the time of file generation in the file management system.
Step S101: In the figure, first, the file operation unit 22 of the file server 2 receives an instruction to create a new file from the user terminal 1, and writes the instructed file in the storage unit 21. Here, it is assumed that the file operation unit 22 of the file server 2 newly writes a file “Sample.txt” in which the content a is described under the folder “/ TEST” generated in the storage unit 21. .

  Step S102: The detection unit 61 of the backup processing unit 6 detects the creation of a file from the log output from the file operation unit 22 of the file server 2 or the packet captured by the packet capture device 9. When the creation of the file is detected by the detection unit 61, the backup file generation unit 62 copies the created file “/TEST/Sample.txt” including the folder hierarchy (directory) to the backup area, Create a backup file. It is assumed that the file name of this backup file is obtained by adding “...” + “child number” to the extension of the copied file name. Since the backup file “/TEST/Sample.txt” does not exist under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4, the backup file generation unit 62 sets “0” as the child number. Is given. Therefore, the backup file generation unit 62 copies the file “/TEST/Sample.txt” stored in the file server 2 under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4. Create the file “/TEST/Sample.txt...0”.

  Step S103: Next, the table updating unit 63 of the backup processing unit 6 updates the backup management table. When the table update unit 63 assigns a new management ID, the assigned management number, the file update time in which the file creation time is set, the operation target file, that is, the file created in the storage unit 21 of the file server 2 are created. File name “/TEST/Sample.txt”, IP address, login user, and the file name “/ TEST / Sample” of the backup file created under the folder “/ BACKUP” in the backup area of the backup storage 4 Register a record with ".txt ... 0" set in the backup management table. In the backup file folder name set in the backup management table, the folder name “/ BACKUP” of the backup area is omitted. The file update time, IP address, and logged-in user are acquired from the log or the captured packet, but the current time may be set as the file update time.

FIG. 8 is a diagram for explaining processing at the time of overwriting a file in the file management system.
Step S111: After the processing of FIG. 7, the file operation unit 22 of the file server 2 receives an instruction from the user terminal 1 and overwrites the file stored in the storage unit 21. Here, the file operation unit 22 of the file server 2 has the file “/TEST/Sample.txt” stored in the storage unit 21 from the content a described to the content b described. Suppose that

  Step S112: The detection unit 61 of the backup processing unit 6 detects the overwriting of the file from the log output from the file operation unit 22 of the file server 2 or the packet captured by the packet capture device 9. When the detection unit 61 detects overwriting of the file, the backup file generation unit 62 copies the overwritten file including the hierarchical folder to the backup area to create a backup file. The backup file “/TEST/Sample.txt” has already been generated under the folder “/ BACKUP” in the backup area created in the backup storage unit 4, and its child number is “0”. The file generation unit 62 assigns “1” as a child number of the backup file name. Therefore, the backup file generation unit 62 stores the file “/TEST/Sample.txt” of the content b stored in the file server 2 under the folder “/ BACKUP” of the backup area generated in the backup storage unit 4. "/TEST/Sample.txt...1" is created.

  Step S113: Subsequently, the table update unit 63 of the backup processing unit 6 updates the backup management table. When a new management ID is assigned, the table update unit 63 assigns the management number, the file update time in which the time when the file was overwritten, the operation target file, that is, the storage unit 21 of the file server 2. The file name “/TEST/Sample.txt” of the overwritten file, the IP address, the login user, and the file name “/ BACKUP” of the backup file created under the folder “/ BACKUP” in the backup area of the backup storage unit 4 Register the record with "TEST / Sample.txt ... 1" set in the backup management table. The file update time, IP address, and logged-in user are acquired from the log or the captured packet, but the current time may be set as the file update time.

FIG. 9 is a diagram for explaining processing at the time of file deletion in the file management system.
Step S121: The file operation unit 22 of the file server 2 receives an instruction from the user terminal 1 and deletes the file stored in the storage unit 21. Here, it is assumed that the file “/TEST/Sample.txt” stored in the storage unit 21 is deleted after the processing of FIG.

  Step S122: The detection unit 61 of the backup processing unit 6 deletes the file “/TEST/Sample.txt” from the log output from the file operation unit 22 of the file server 2 or from the packet captured by the packet capture device 9. Is detected.

  Step S123: When deletion of the file is detected by the detection unit 61, the backup file generation unit 62 creates a dummy file indicating deletion in the backup area (hereinafter referred to as a deletion dummy file). The file name of the dummy file for deletion is assumed to be obtained by adding “... d ...” + “child number” to the extension of the deleted file name. Since there is no dummy file for deletion of “/TEST/Sample.txt” under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4, the backup file generation unit 62 uses the child number as a child number. “0” is assigned. Therefore, the backup file generation unit 62 has the file name “/TEST/Sample.txt...d...0” under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4. Create a deletion dummy file. The contents are not described in the dummy file for deletion.

  Step S124: Subsequently, the table update unit 63 of the backup processing unit 6 updates the backup management table. When the table update unit 63 assigns a new management ID, the management ID, the file update time in which the time when the file was deleted, and the file to be operated, that is, the file deleted from the file server 2 21 are stored. File name “/TEST/Sample.txt”, IP address, login user, and file name of the dummy file for deletion created in the backup storage unit 4 “/TEST/Sample.txt...d...0 "Is registered in the backup management table. The file update time, IP address, and logged-in user are acquired from the log or the captured packet, but the current time may be set as the file update time.

  When “/TEST/Sample.txt” is created again in the storage unit 21 of the file server 2 after FIG. 9, the file operation unit 22 copies the backup file name “/ BACKUP / TEST / If a backup file of `` Sample.txt ... 2 '' is created and this re-created file `` /TEST/Sample.txt '' is deleted, the dummy file for deletion `` /BACKUP/TEST/Sample.txt .. .d ... 1 ".

FIG. 10 is a diagram for explaining processing when a file name is changed in the file management system.
Step S131: The file operation unit 22 of the file server 2 receives an instruction from the user terminal 1, and changes the name of the file stored in the storage unit 21. Here, after the processing in FIG. 7, the file operation unit 22 of the file server 2 renames the file “Sample.txt” under the file “/ TEST” stored in the storage unit 21 to “Sample2.txt”. ”.

  Step S132: The detection unit 61 of the backup processing unit 6 detects a file name change from the log output from the file operation unit 22 of the file server 2 or the packet captured by the packet capture device 9. When the change of the file name is detected by the detection unit 61, the backup file generation unit 62 copies the file “/TEST/Sample2.txt” after the file name change including the hierarchical folder to the backup area, Create a backup file. Since the backup file “/TEST/Sample2.txt” is not generated under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4, the backup file generation unit 62 sets the child number as a child number. “0” is assigned. Therefore, the backup file generation unit 62 copies the file “/TEST/Sample2.txt” stored in the file server 2 under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4. Create a backup file name "/TEST/Sample2.txt...0".

  Step S133: Subsequently, the backup file generation unit 62 internally generates a deletion signal on the assumption that the deletion of the file “/TEST/Sample.txt” before the file name change is detected in the backup area. As a result, the backup file generation unit 62 creates a deletion dummy file. Since there is no dummy file for deletion of “/TEST/Sample.txt” under the folder “/ BACKUP” in the backup area generated in the backup storage unit 4, the backup file generation unit 62 uses the child number as a child number. “0” is assigned. Therefore, the backup file generation unit 62 deletes the dummy file “/TEST/Sample.txt...d...0” under the backup area folder “/ BACKUP” generated in the backup storage unit 4. Create The content of the created deletion dummy file is a copy of the file “/TEST/Sample2.txt” after the file name change stored in the storage unit 21 of the file server 2.

Step S134: The table update unit 63 of the backup processing unit 6 updates the backup management table. When a new management ID is assigned, the table update unit 63 assigns the management number, the file update time in which the file name is changed, the file name “/TEST/Sample.txt” before the change, the IP address , Log-in user, and record with the file name “/TEST/Sample.txt...d...0” of the dummy file for deletion registered in the backup management table. Furthermore, when a new management ID is assigned, the table update unit 63 assigns the management number, the file update time in which the file name is changed, the changed file name “/TEST/Sample2.txt”, IP Register the record in which the address, login user, and backup file name “/TEST/Sample2.txt...0” are set in the backup management table.
The file update time, IP address, and logged-in user are acquired from the log or captured packet, but the current time may be set as the file update time.
As described above, when changing the file name, the file before the file name change is deleted, and the same processing as when the file after the file name change is created is performed.

  FIG. 11 and FIG. 12 are diagrams for explaining processing when a folder name is changed in the file management system.

FIG. 11 is a diagram for explaining provisional countermeasure processing when a folder name is changed by the file management system.
Step S141: In the figure, the file operation unit 22 receives an instruction from the user terminal 1 and changes the folder name of the file stored in the storage unit 21. Here, the folder “/ TEST / FOLDER_1” in which “Sample.txt” exists is stored in the storage unit 21 of the file server 2, and the file operation unit 22 that receives an instruction from the user terminal 1 stores the folder name. Suppose you change "FOLDER_1" to the folder name "FOLDER_A".

  Step S142: The detection unit 61 of the backup processing unit 6 detects the change of the folder name from the log output from the file operation unit 22 of the file server 2 or the packet captured by the packet capture device 9.

  Step S143: When the change of the folder name is detected by the detection unit 61, the backup file generation unit 62 displays a dummy file indicating the change of the folder name in the backup area (hereinafter referred to as “dummy file for changing the folder name”). Is generated. This dummy file for folder name change is under the folder upstream from the folder whose folder name has been changed, and the file name is "folder name before change" + "... r ..." + "folder name after change "+" ... "+" child number ". Since there is no folder name changing dummy file under the folder “/ BACKUP / TEST” in the backup area generated in the backup storage unit 4, the backup file generation unit 62 assigns “0” as a child number. . Therefore, the backup file generation unit 62 has the file name “/TEST/FOLDER_1...r...FOLDER_A...0 under the backup area folder“ / BACKUP ”generated in the backup storage unit 4. A dummy file for changing the folder name is created. The contents are not described in the dummy file for folder name change.

  Step S144: Next, the table update unit 63 of the backup processing unit 6 updates the folder name change management table. When the table update unit 63 assigns a new management ID, the management ID, the folder name change time, the pre-change folder name “/ TEST / FOLDER_1”, the IP address, the login user, and the post-change folder name “/ TEST / FOLDER_A” Register the record with the name in the folder name change management table. The folder name change time, the pre-change folder name, the post-change folder name, the IP address, and the login user are acquired from the log or the captured packet, but the current time may be set as the folder name change time.

  If the folder name “FOLDER_A” of the folder “/ TEST / FOLDER_A” stored in the storage unit 21 of the file server 2 is subsequently changed to “FOLDER_B”, the detection unit 61 of the backup processing unit 6 The change of the folder name is detected from the log output from the file operation unit 22 of the file server 2 or the packet captured by the packet capture device 9. The backup file generation unit 62 has a file name “/TEST/FOLDER_A...r...FOLDER_B...x” under the backup area folder “/ BACKUP” generated in the backup storage unit 4 ( Create a dummy file for changing the folder name, where x is a child number. When the table updating unit 63 of the backup processing unit 6 assigns a new management ID, the management ID, folder name change time, pre-change folder name “/ TEST / FOLDER_A”, IP address, login user, post-change folder name “ Register the record with "/ TEST / FOLDER_B" set in the folder name change management table.

  If the folder name is changed, the files under that folder are also affected. That is, it is necessary to generate a backup file using a new folder name for all files under the renamed folder. However, if there are many files under the folder, the backup file generation process takes time. Therefore, immediately after the folder name is changed, a folder name change dummy file is generated as described above, and the folder name change is registered in the folder name change management table. To deal with permanent folder name changes.

FIG. 12 is a diagram for explaining a permanent handling process when a folder name is changed in the file management system.
Step S151: In the figure, the backup file generation unit 62 of the backup processing unit 6 internally generates a rewrite signal at a predetermined time when the operation rate is low. The backup file generation unit 62 reads a record from the folder name change management table in the table storage unit 5 when receiving the rewrite signal. Here, it is assumed that a record in which the folder name change time “T2”, the pre-change folder name “/ TEST / FOLDER_1”, and the post-change folder name “/ TEST / FOLDER_A” are set is read.

  The backup file generation unit 62 refers to the backup management table and identifies the target file under the pre-change folder name “/ TEST / FOLDER_1” set in the read record. Then, the following is performed for each identified target file.

The backup file generation unit 62 selects a record in which the file update time is before the folder change time “T2” and the latest time among the records of the backup management table in which the target file is set. For example, for the target file name “/TEST/FOLDER_1/File1.txt”, the file update time is before the folder change time “T2”, and the backup file name “/TEST/FOLDER_1/File1.txt .. .0 ”,…,“ /TEST/FOLDER_1/File1.txt...d...0 ”,…“ /TEST/FOLDER_1/File1.txt...5 ”is detected. Select a record with "/TEST/FOLDER_1/File1.txt...5" set. For the target file name “/TEST/FOLDER_1/File3.txt”, the file update time is before the folder change time “T2”, and the backup file name “/TEST/FOLDER_1/File3.txt .. .0 ", ...," /TEST/FOLDER_1/File3.txt...d...0 "is detected, a record with" /TEST/FOLDER_1/File3.txt...d. Select a record with "..0" set.
Here, it is assumed that only the record in which “/TEST/FOLDER_1/Sample.txt...0” is set is selected.

  When the backup file name set in the selected record is the file name of the dummy file for deletion, the backup file generation unit 62 terminates without doing anything because the file has been deleted before the folder name is changed. If the backup file name is not the file name of the dummy file for deletion, the process from step S152 is performed.

  Step S152: The backup file generation unit 62 generates a deletion dummy file corresponding to the specified backup file and writes it in the same folder. That is, the specified backup file name “/BACKUP/TEST/FOLDER_1/Sample.txt...0” is copied and a dummy file for deletion is created. It is assumed that the name of the dummy file for deletion is obtained by replacing the part “...” + “child number” below the extension with “... d ...” + “child number”. Since there is no deletion dummy file for the same target file under “/ BACKUP / TEST / FOLDER_1”, assign “0” to the child number and assign the file name to “/ BACKUP / TEST / FOLDER_1 / Sample” .txt ... d ... 0 ". This corresponds to a deletion dummy file indicating that “/ TEST / FOLDER — 1 / Sample.txt” stored in the storage unit 21 of the file server 2 has been deleted.

Further, the backup file generation unit 62 acquires the changed folder name “/ TEST / FOLDER_A” from the record read from the folder name change management table. The backup processing unit 6 creates a backup file after changing the folder name under the backup area “/ BACKUP” of the backup storage unit 4. In other words, the backup file generation unit 62 copies the backup file specified above, changes the folder name before change to the folder name after change, and backs up the file by changing the numeric part of the version to “0”. Write to the folder of the area. Here, “/BACKUP/TEST/FOLDER_1/Sample.txt...0” was identified, so the backup file name “/ BACKUP / TEST / FOLDER_A / Sample” was replaced by “TEST / FOLDER_1” with “TEST / FOLDER_A”. A backup file of “.txt ... 0” is created.
For example, if the specified backup file is "/BACKUP/TEST/FOLDER_1/File1.txt...5", the backup file with the file name "/BACKUP/TEST/FOLDER_A/File1.txt...0" Will be created.

Step S153: Subsequently, when the table updating unit 63 of the backup processing unit 6 assigns a new management ID, the management ID, the file update time, and the file name “/ TEST / FOLDER_1 / Sample. Register a record in which “txt”, IP address, login user, and file name “/TEST/FOLDER_1/Sample.txt...d...0” of the generated dummy file for deletion are set in the backup management table. As the file update time, the folder name change time “T2” set in the record read from the folder name change management table in step S151 is set.
Furthermore, when the table update unit 63 assigns a new management ID, the management ID, the file update time, the file name after the folder name change “/TEST/FOLDER_A/Sample.txt”, the IP address, the login user, and Register the record in which the file name “/TEST/FOLDER_A/Sample.txt...0” under the backup folder name “/ BACKUP” of the generated backup file is set in the backup management table. Similarly, the folder name change time “T2” is set as the file update time.

  When the above processing is completed for all target files under the pre-change folder “/ TEST / FOLDER_1”, the backup file generation unit 62 exists in the pre-change folder “/ TEST / FOLDER_1” under “/ BACKUP” in the backup area. Delete the folder change dummy file "FOLDER_1 ... r ... FOLDER_A ... 0". Furthermore, the table update unit 63 records the record specified in step S151 from the backup management table, that is, the record in which the folder name before change “/ TEST / FOLDER_1” and the folder name after change “/ TEST / FOLDER_2” are registered. delete.

  If the folder name change management table grows, processing will increase and it will take time to display the file list when a search is performed. A file and a backup file are generated, and the backup management table is reduced.

FIG. 13 is a diagram for explaining file restoration processing in the file management system, and is processing when there is no change in the folder name.
Step S161: In the figure, the user wants to restore the file to the file restoration area for the user in the backup storage unit 4 specified by a predetermined folder name by accessing the file restoration unit 7 from the user terminal 1 of the user. Specify the date and time (hereinafter referred to as “restoration date and time”). For example, as this restoration target date and time, an instruction for creating a folder indicating the restoration target date and time is input. Here, in order to restore the file at the time “MM month DD date HH hour MM minute”, the folder “MM_DD_HH_MM” is created. Therefore, if the restoration target date and time is “January 2 15:00”, the folder “01_02_1500” is created. The file restoration area for the user may be in the storage unit 21 of the file server 2, may be in the file restoration unit 7, or may be a database device connected to the file restoration unit 7. .

  Step S162: The search unit 71 of the file restoration unit 7 receives a folder creation instruction from the user terminal 1. Alternatively, similar to the file server 2, an operation log may be received from the backup storage unit 4 to detect the creation of a folder. The search unit 71 of the file restoration unit 7 searches the backup management table in the table storage unit 5, extracts a record in which the file update time before the restoration target date and time is set, and among the extracted records, If there is a file with the same target file name, only the record closest to the restoration target date and time is left. Thereby, a record in which a file update time before the restoration target date and time is set and a different target file name is set for each is extracted. Subsequently, the search unit 71 selects the extracted records one by one in order, and performs the following processing. In this example, the file update time “2009/01/02/1200”, the target file name “/TEST/Sample.txt”, and the backup file name “/TEST/Sample.txt...1” are set. Suppose that only records are identified.

  If the search unit 71 determines that the file name of the dummy file for deletion is not set in the record specified above, the search unit 71 starts from the target file name “/TEST/FOLDER_1/Sample.txt” set in the record. The path name “/ TEST / FOLDER_1” is read, and the folder name change management table is searched for a record in which the read path name and the folder name change time before the restoration target date and time are set. Here, it is assumed that there is no record to be identified, that is, a record indicating that the folder name has been changed before the restoration target date and time “January 2 15:00” is not registered. If a record indicating that the folder name has been changed is not registered, the following processing in step S163 and subsequent steps is performed. If a record indicating that the folder name has been changed is registered, the process of FIG. Shall be performed.

  Step S163: The restoration unit 72 stores the file “/ TEST / indicated by the target file name in the specified record under the folder“ (folder of file restoration area for user) / 01_02_1500 ”generated by the user in Step S161. FOLDER_1 / Sample.txt "is generated. Then, the restoration unit 72 generates the “(user file restoration area folder) /01_02_1500/TEST/Sample.txt” under the backup area “/ BACKUP” in which the specified record is set. Create and store a symbolic link indicating that the backup file with the backup file name "/TEST/FOLDER_1/Sample.txt...1" is referenced.

  Step S164: The restoration unit 72 displays a screen indicating that the file “/TEST/FOLDER_1/Sample.txt” exists under the “(user file restoration area folder) / 01_02_1500” generated by the user. It is displayed on the user terminal 1. When the user inputs this file display request to the user terminal 1, the restoration unit 72 of the file restoration unit 7 receives the display request and the file name from the user terminal 1. The restoration unit 72 includes a backup area “/ BACKUP” indicated in the symbolic link corresponding to the received file name “(file restoration area folder for user) /01_02_1500/TEST/FOLDER_1/Sample.txt”. The backup file with the subordinate backup file name “/TEST/FOLDER_1/Sample.txt...1” is read out, returned to the user terminal 1 and displayed.

  In step S161, the restoration target date and time “January 3, 15:00” is specified, and in step S162, the search unit 71 of the file restoration unit 7 searches the backup management table in the table storage unit 5. , Identified records with file update time “2009/01/03/1200”, target file name “/TEST/Sample.txt”, backup file name “/TEST/Sample.txt...2” Shall. The search unit 71 specifies that the backup file of the identified record is not a dummy file for deletion, but the path name “/ TEST / FOLDER_1” read from the target file name of the record and the restoration target in the folder name change management table If it is determined that there is no record in which the folder name change time before the date / time is set, in step S163, the restoration unit 72 determines that the file “/ TEST” is subordinate to “(folder of user file restoration area) / 01_04_1500”. /FOLDER_1/Sample.txt ”is generated, and the file refers to the backup file with the backup file name“ /TEST/FOLDER_1/Sample.txt...2 ”under the backup area“ / BACKUP ” Create and remember links. Thereby, in step S164, the restoration unit 72 indicates that “/TEST/FOLDER_1/Sample.txt” exists under “(folder of file restoration area for user) / 01_03_1500” generated by the user. A screen is displayed on the user terminal 1. When the user inputs a display request for the displayed file to the user terminal 1, the restoration unit 72 of the file restoration unit 7 adds a file name “(folder of file restoration area for user) / 01_03_1500 / TEST / to the symbolic link. Reads the backup file “/TEST/FOLDER_1/Sample.txt...2” under the backup area “/ BACKUP” that indicates that it corresponds to “FOLDER_1 / Sample.txt”, returns it to the user terminal 1, and displays it. Let

  In step S161, the restoration target date and time “January 4, 15:00” is specified, and in step S162, the search unit 71 of the file restoration unit 7 searches the backup management table in the table storage unit 5. , Time "2009/01/04/1200", target file name "/TEST/FOLDER_1/Sample.txt", backup file name "/TEST/FOLDER_1/Sample.txt...d...1" The specified record is identified. Since the search unit 71 determines that the backup file of the identified record is a dummy file for deletion, the restoration unit 72 determines that the identified record is under “(folder of file restoration area for user) / 01_04_1500”. A folder “/ TEST / FOLDER_1” read from the target file name of the file is generated and displayed on the user terminal 1, but the file name is not displayed because the file does not exist.

FIG. 14 is a diagram for explaining file restoration processing in the file management system, and is processing when there is a change in folder name.
Step S171: The same processing as step S161 of FIG. 13 described above is performed. Here, it is assumed that the restoration target date and time “January 3, 15:00” is designated.

  Step S172: The same process as step S162 of FIG. 13 described above is performed. Here, the search unit 71 of the file restoration unit 7 searches the backup management table in the table storage unit 5, the file update time “2009/01/02/1200”, and the target file name “/TEST/Sample.txt”. Then, the record having the backup file name “/TEST/Sample.txt...1” is identified, and it is determined that the file name of the dummy file for deletion is not set in the identified record. Subsequently, the search unit 71 reads the folder name “/ TEST” from the target file name “/TEST/Sample.txt” set in the record, and reads the folder name before change in the folder name change management table. A record in which a folder name is set and a folder name change time before the restoration target date and time is set is specified. Here, it is assumed that a record in which the file name change time “2009/01/03/1200”, the pre-change folder name “/ TEST”, and the post-change folder name “/ TEST2” are set is specified. Further, the search unit 71 sets a record in which the folder name “/ TEST2” after the change of the specified record is set to the folder name before the change, and the folder name change time before the restoration target date and time is set. It is assumed that there is no corresponding record here.

  Step S173: As shown in FIG. 13, if the folder has not been changed, the restoration unit 72 specifies the folder “(file restoration area folder for user) / 01_03_1500” generated by the user. The file “/TEST/Sample.txt” indicated by the target file name in the record of the folder name change management table is generated. However, because the folder name has been changed here, “(File restore area for user Folder) / 01_03_1500 ”, the folder“ / TEST ”before the change is replaced with the folder“ / TEST2 ”after the change, and the file“ Sample.txt ”is generated under the folder. The user restoration unit 72 creates the backup area “/ BACKUP” in which the generated “(user file restoration area folder) /01_03_1500/TEST2/Sample.txt” is indicated by the record of the backup management table identified in step S172. Create and store a symbolic link that indicates that the backup file name under "/TEST/Sample.txt...1" is referenced.

  Step S174: The restoration unit 72 displays a screen indicating that “/TEST2/Sample.txt” exists under the folder “(folder of file restoration area for user) / 01_02_1500” generated by the user. To display. When the user inputs a display request for this file to the user terminal 1, the restoration unit 72 of the file restoration unit 7 receives the display request and the file name from the user terminal 1. The restoration unit 72 is subordinate to the backup area “/ BACKUP”, which indicates that the received file name “(folder of file restoration area for user) /01_03_1500/TEST2/Sample.txt” corresponds to the symbolic link. The backup file “/TEST/Sample.txt...1” is read out and returned to the user terminal 1 for display.

  In step S171, the restoration target date and time “January 4, 15:00” is designated, and in step S172, the search unit 71 of the file restoration unit 7 searches the backup management table in the table storage unit 5, Identify the record with the file update time “2009/01/04/1000”, target file name “/TEST2/Sample.txt”, backup file name “/TEST2/Sample.txt...0”, It is determined that no deletion dummy file is set in the identified record. Subsequently, the search unit 71 reads the folder name “/ TEST2” from the file name “/TEST2/Sample.txt” set in the record, and reads the folder read to the folder name before change in the folder name change management table. A record in which a name is set and a folder name change time before the restoration target date and time is set is specified. Here, a record in which the file name change time “2009/01/04/1200”, the pre-change folder name “/ TEST2”, and the post-change folder name “/ TEST3” are specified.

  In this case, in step S173, a folder in which the folder “/ TEST2” before change is replaced with the folder “/ TEST3” after change under the folder “(file restore area folder for user) / 01_04_1500” generated by the user. Create a file “Sample.txt” under the folder. The restoration unit 72 generates the backup area “/ BACKUP” in which the generated “(user file restoration area folder) /01_03_1500/TEST3/Sample.txt” is indicated by the record of the backup management table identified in step S172. Create and store a symbolic link indicating that the backup file with the subordinate backup file name "/TEST2/Sample.txt...0" is referenced.

  In step S174, the restoration unit 72 displays a screen indicating that “/TEST3/Sample.txt” exists under the folder “(folder of user file restoration area) / 01_04_1500” generated by the user. It is displayed on the terminal 1. When the user inputs a display request for this file to the user terminal 1, the restoration unit 72 of the file restoration unit 7 receives the display request and the file name from the user terminal 1. The restoration unit 72 includes, in the symbolic link, the backup file “/ BACKUP” under the received file name “(user file restoration area folder) /01_03_1500/TEST3/Sample.txt”. The backup file “/TEST2/Sample.txt...1” is read and returned to the user terminal 1 for display.

FIG. 15 is a diagram for explaining search crawl processing in the file management system.
Step S181: In the figure, the user terminal 1 accesses the search portal unit 73 of the file restoration unit 7. Thereby, the search portal part 73 displays the search screen for inputting search conditions on the user terminal 1. When a user inputs a search condition such as a keyword or a file extension using an input means such as a keyboard provided in the user terminal 1 and clicks a search button, the user terminal 1 sends the input search condition to the search portal unit 73. Send.

  Step S182: The search portal unit 73 transmits the input search conditions to the search engine unit 74 and requests a search.

  Steps S183 and S184: The search engine unit 74 searches the backup area, that is, under the “/ BACKUP” folder generated in the storage unit 21, the keyword in the received search condition is described in the contents, and The backup file having the extension in the search condition is specified, and the backup file name is acquired with a path name.

  Step S185: The search engine unit 74 outputs the backup file name acquired as the search result to the search portal unit 73 as the search result.

  Step S186: When the search portal unit 73 receives the search result, the search unit 71 performs the following processing for each backup file name included in the search result.

(1) The search unit 71 identifies a record in the backup management table in which the backup file name is set, and reads the target file name and the file update time from the record. The file update time read here is defined as the existence start time. For example, specify a record in the backup management table that is set to "/ BACKUP" or less in the backup file name "/BACKUP/TEST/Sample.txt...0", and the target file name "/ TEST / “Sample.txt” and file update time “2008/01/01/12: 00: 00” are read out.

(2) The search unit 71 is after the existence start time among the records in the backup management table in which the same target file name read in (1) is set, and at the existence start time. The record for which the closest time is set is specified, and the file update time read from the specified record is set as the existence end time. Here, among the records in the backup management table in which the target file name “/TEST/Sample.txt” is set, the existence start time is “2008/01/01/12: 00: 00” or later, and The existence end time “2008/01/03/10: 00: 00” is read from the record in which the file update time closest to the existence start time is set.

(3) The search unit 71 sets a folder name change time from the existence start time to the existence end time in the folder name change management table, and sets the folder name included in the target file name as the folder name before change. Determine if there are any records set. If not included, the search unit 71 stores the backup file name, the target file name, and the existence period indicated by the existence start time and the existence end time in association with each other.

  For example, in the folder name change management table, the time between the existence start time “2008/01/01/12: 00: 00” and the existence end time “2008/01/03/10: 00: 00” is set. And a record in which the folder name “/ TEST” included in the target file name “/TEST/Sample.txt” is set as the folder name before change is searched. When there is no corresponding record, the search unit 71 sets the backup file name “/BACKUP/TEST/Sample.txt...0”, the target file name “/TEST/Sample.txt”, the existence start time and the existence end. The existence period “2008/01/01/12: 00: 00 to 2008/01/03/10: 00: 00” indicated by the time is stored in association with each other.

  On the other hand, in the folder name change management table, there is a record in which the folder name change time from the existence start time to the existence end time is set and the folder name included in the target file name is set as the folder name before change. Suppose that it is registered. The search unit 71 reads the changed folder name and the folder name change time from this record, and sets the read folder name change time as the existence end time before the folder name change and the start time after the folder name change. The search unit 71 stores the backup file name, the target file name, and the existence period indicated by the existence start time and the existence end time before the folder name in association with each other, and stores the backup file name and the folder name before the change. The target file name replaced with the folder name after the change, and the existence period indicated by the existence start time and the existence end time before the folder name are stored in association with each other.

  For example, in the folder name change management table, the time between the existence start time “2008/01/01/12: 00: 00” and the existence end time “2008/01/03/10: 00: 00” is the folder name. Search portal when the change time is set and the record includes the folder name “/ TEST” included in the target file name “/TEST/Sample.txt” as the folder name before change The unit 73 reads the changed folder name “/ TEST2” and the folder name change time “2008/01/02/12: 00: 00” from the record. The search portal unit 73 uses the backup file name “/BACKUP/TEST/Sample.txt...0”, the target file name “/TEST/Sample.txt”, the existence start time and the existence end time before the folder name change. The displayed existence period “2008/01/01/12: 00: 00 to 2008/01/02/12: 00: 00” is stored in association with the backup file name “/BACKUP/TEST/Sample.txt”. ... 0 ”, the target file name“ /TEST2/Sample.txt ”in which the folder name“ / TEST ”before the change is replaced with the folder name“ / TEST2 ”after the change, the existing start time and the existing end before the folder name change The existence period “2008/01/02/12: 00: 00 to 2008/01/03/10: 00: 00” indicated by the time is stored in association with each other.

  Step S186: When the search portal unit 73 receives the information that associates the backup file name, the target file name, and the existence period stored in the search unit 71 in Step S185, the search portal unit 73 associates the target file name with the existence period. The list is returned to the user terminal 1 as a search result and output. The target file name is linked with the corresponding backup file name. The target file name and the backup file name may be associated with each other by a symbolic link.

  The search unit 71 reads the login user and IP information from the records in the backup management table and the folder name change management table in which each backup file name is set, and the search portal unit 73 corresponds to the backup file name. The login user and the IP may be displayed on the user terminal 1 together with the target file name. Moreover, the precision of the time displayed as an existing period can be set arbitrarily.

The user who has browsed the search result clicks or double-clicks on the target file name displayed on the screen with the mouse provided in the user terminal 1 to instruct to download or execute the file. When the user terminal 1 receives the backup file name linked to the target file name, the restoration unit 72 reads the backup file with the backup file name from the backup storage unit 4 and downloads it to the user terminal 1 or stores the contents. Display. An arbitrary user interface can be used for a download or execution instruction in the user terminal 1.
When searching by file name or the like, the file update history can be displayed by the above procedure.

FIG. 16 is a diagram for explaining the backup management table and the recovery processing of the backup management table in the file management system.
First, the table recovery unit 8 of the file management device 3 searches for a backup area in the backup storage unit 4, that is, a file existing under “/ BACKUP”. Then, for each file obtained as a result of this search, the following processing is performed in order from the oldest file generation time.
(1) When the file obtained as a result of the search is a backup file or a deletion dummy file, when the table recovery unit 8 assigns the management ID of the backup management table, the assigned management ID, the generation time of the file, the search The records obtained by setting the file name after the folder “/ BACKUP” of the file as management ID, file update time, and backup file name are registered in the backup management table. Then, the file name obtained by deleting the character string after “...” from the backup file name set in the record is written in the target file name of the registered record.

(2) When the file obtained as a result of the search is a folder name change dummy file, when the table recovery unit 8 assigns the management ID of the folder name change management table, the assigned management ID and the folder name change dummy file Change the folder name to the record set in the management ID, the folder name change time, the file name before the change, and the file name after the change. Write to the management table.

  For example, backup files `` /BACKUP/TEST/Sample.txt...0 '', `` /BACKUP/TEST/Sample.txt...1 '', `` TEST ... r ... .TEST2 ... 0 "," /BACKUP/TEST2/Sample.txt...0 ", and" /BACKUP/TEST2/Sample.txt...d...0 "are detected. These files are given file generation times by an OS (Operation System) when the files are generated, and the generation times are T1, T2, T3, T4, and T5 in order.

  The table recovery unit 8 first selects the backup file name “/BACKUP/TEST/Sample.txt...0” at the generation time T1, and the file name “/TEST/Sample.txt ..” after “/ BACKUP”. .0 ”as the backup file name,“ /TEST/Sample.txt ”excluding“ ... 0 ”from the backup file name, the record with the file generation time T1 set as the file update time Register in the backup management table.

  Next, the table recovery unit 8 selects the backup file name “/BACKUP/TEST/Sample.txt...1” at the generation time T2, and the file name “/TEST/Sample.txt.” After “/ BACKUP”. ..1 ”as the backup file name,“ /TEST/Sample.txt ”excluding“ ... 1 ”from the backup file name as the target file name, and the file generation time T2 as the file update time Is registered in the backup management table.

  Next, the table restoration unit 8 selects the folder name change dummy file name “TEST ... r ... TEST2 ... 0” at the generation time T3, the folder name before change “/ TEST”, and after change A record in which the folder name “/ TEST2” and the file generation time T3 are set as the folder change time is registered in the folder name change management table.

  Next, the table restoration unit 8 selects the backup file name “/BACKUP/TEST2/Sample.txt...0” at the generation time T4, and the file name “/TEST2/Sample.txt.” After “/ BACKUP”. ..0 ”as the backup file name,“ /TEST2/Sample.txt ”with“ ... 0 ”removed from the backup file name as the target file name, and file creation time T4 as the file update time Is registered in the backup management table.

  Next, the table recovery unit 8 selects the deletion dummy file name “/BACKUP/TEST2/Sample.txt...d...0” at the generation time T5, and the file name “/ BACKUP” and subsequent file names “/ BACKUP”. TEST2 / Sample.txt ... d ... 0 ”is the backup file name, and“ /TEST/Sample.txt ”is the target file name, with“ ... d ... 0 ”removed from the backup file name. In addition, a record in which the file generation time T5 is set as the file update time is registered in the backup management table.

As described above, since the backup entity file and the management table are included, the backup management table and the folder name change management table can be restored from the entity backup file even if the table is destroyed.
When the IP and login user are also restored, the file name is obtained by adding the IP and login user to the backup file name, the deletion dummy file, and the folder name change dummy file.

In the present embodiment, each time a file is created, overwritten, or deleted in the storage unit 21 of the file server 2, the file is duplicated, so that a large capacity of the backup storage unit 4 that is a storage for storing backups is required. It becomes. Therefore, the following technique for efficiently storing only the necessary files is applied.
For example, as a storage means for the backup area, a storage product that implements a deduplication technique that stores only the differences between files is used. Since the backup file generated in this file management system is assumed to have a small difference, it is assumed that the compression effect by the deduplication technique is high.
As products using such deduplication technology, “Next Generation Grid Storage NEC Storage HS Series, NEC Corporation, Internet <http://www.nec.co.jp/press/en/0709/1901.html > ”,“ Data Domain, Internet <http://www.datadomain.com/jp/ ”,“ Veritas NetBackup PureDisk, Symantec, Internet <http://www.symantec.com/en/jp/business/netbackup- puredisk>"etc. can be used.

  In addition, there is a specific application that creates a temporary file on the file server 2 during work, and the user does not explicitly take out this file unless there is a system failure or the like. Therefore, for such temporary files, the storage capacity is efficiently used by not generating a backup. Therefore, the temporary file is, for example, “˜ $ abc.xxx” and includes a predetermined character string “˜ $” indicating that it is a temporary file. Therefore, when a predetermined character string indicating such a temporary file is included in the operation target file name, it is excluded from the above processing.

  Further, when the same target file is overwritten at intervals of 1 second to 2 seconds, it is highly likely that the file with the older time is unnecessary. Therefore, when the same target file is overwritten at a predetermined short interval such as 2 seconds or less, if a backup file is not generated for the target file at the earlier time, or if a backup file has already been generated Delete the backup file with the old time and the record in the backup management table related to the backup file, create a backup file for the target file with the new time in the backup area, Only records related to the backup file of this new time are registered.

FIG. 17 is a diagram showing an example of a user interface of the file management server.
In FIG. 17A, the user accesses the file restoration unit 7 from his / her user terminal 1, and creates a folder in the file restoration area for the user. Then, a pull-down menu is displayed with a mouse or the like, and a menu “return to the past” is selected. The file restoration unit 7 displays a restoration target time input screen on the user terminal 1. When the user terminal 1 inputs the restoration target time, the file restoration unit 7 receives the restoration target time input from the user terminal 1. The file restoration unit 7 performs processing as shown in FIGS. 13 and 14 and restores the files existing under the folder at the restoration target time.

  In FIG. 17B, the user accesses the search portal unit 73 of the file restoration unit 7 from his / her user terminal 1. The search portal unit 73 displays a search screen on the user terminal 1. The user inputs an instruction to include the search target file name and the past file in the search on the search screen. The search portal unit 73 of the file restoration unit 7 performs a search as shown in FIG. 15 based on the received search condition, and displays the obtained search result on the user terminal 1.

According to the above embodiment, since a backup file is generated every time a file is changed, it is possible to restore a file at an arbitrary time, and at a target time by a folder name change management table that manages the generated backup file. The existing backup file can be searched at high speed. Restoration is a method of creating a symbolic link in a folder dedicated to the user, so that the contents currently stored in the file server and other users are not affected. Further, even when the backup management table and the folder name change management table are lost, it is possible to recover from the backup file. When a file is deleted, a dummy file indicating deletion is generated, so that the file management can also be restored to the backup management table.
Furthermore, the storage area of the backup file can be reduced by using a deduplication technique. In this embodiment, since many files having similar data structures can be stored and a large amount of storage area is required, the storage device can be used by combining with a storage device (storage) using a deduplication technique. Efficiency can be improved.

  In addition, the user terminal 1, the file server 2, and the file management apparatus 3 have a computer system inside. The operations of the user terminal 1, the file operation unit 22 of the file server 2, and the backup processing unit 6, the file restoration unit 7, and the table restoration unit 8 of the file management device 3 are read by a computer in the form of a program. It is stored in a possible recording medium, and the computer system reads out and executes this program, so that the above processing is performed. Here, the computer system includes a CPU, various memories, an OS, and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

DESCRIPTION OF SYMBOLS 1 ... User terminal 2 ... File server 21 ... Memory | storage part 22 ... File operation part 3 ... File management apparatus 4 ... Backup memory | storage part 5 ... Table memory | storage part 6 ... Backup process part 61 ... Detection part 62 ... Backup file generation part 63 ... Table Update unit 7: File restoration unit 71 ... Search unit 72 ... Restore unit 73 ... Search portal unit 74 ... Search engine unit 8 ... Table restoration unit 9 ... Packet capture device

Claims (11)

A backup storage unit for storing backup files;
A table storage unit for storing a backup management table for managing the backup file;
Receives operation information indicating the file operation type and file update time, and the target file name including the folder name of the file operation target file, and detects creation or overwriting of the file based on the operation information. A detection unit;
When a file creation or overwriting is detected by the detection unit, a backup file obtained by duplicating a file having a target file name indicated by the operation information is represented by information indicating that it is a backup file and a child number. A backup file generation unit for writing to the backup storage unit by a file name added to the file name;
Information that associates the update time and target file name set in the operation information with the backup file name that is the file name of the backup file generated by the backup generation unit is stored in the backup storage unit A table update unit for writing to the backup management table;
A file management apparatus comprising: The detection unit detects deletion of a file based on the received operation information,
When the detection unit detects a file deletion, the backup file generation unit deletes a dummy file with a file name in which information indicating deletion of the file and a child number are added to the target file name indicated by the operation information To the backup storage unit,
The table update unit stores in the backup storage unit information that associates the update time and target file name set in the operation information with the file name of the deletion dummy file generated by the backup generation unit. Writing to the backup management table
The file management apparatus according to claim 1. The detection unit detects a change in the file name based on the received operation information,
The backup file generation unit deletes the file name by adding information indicating deletion of the file and a child number to the pre-change file name indicated by the operation information when the detection unit detects a change in the file name. A dummy file for use in the backup storage unit, and a backup file obtained by duplicating the file having the changed file name indicated by the operation information, the information indicating that the file is a backup file and the child number are added to the changed file name. Write to the backup storage unit by the file name appended to
The table update unit is information that associates the update time set in the operation information, the target file name indicating the pre-change file name, and the file name of the deletion dummy file generated by the backup generation unit In the backup management table, the update time set in the operation information, the target file name indicating the changed file name, and the backup file name of the backup file generated by the backup generation unit are associated with each other Write the information to the backup management table,
The file management apparatus according to claim 2. Receives information about the recovery target time from the user's terminal, identifies a backup file name whose update time is before the recovery target time from the backup management table as a restoration target, and corresponds to the same target file name as the identified restoration target. A search unit that reads only the backup file name at the update time closest to the recovery target time and reads the target file name corresponding to the backup file name to be restored,
When the search unit generates a file with the target file name read corresponding to the backup file name to be restored in the file recovery area and receives an output instruction for the file generated in the file recovery area A restoration unit that reads out and outputs a backup file of the backup file name to be restored corresponding to the target file name of the file from the backup storage unit;
The file management apparatus according to any one of claims 1 to 3, further comprising: The restoration unit generates a file having the target file name read corresponding to the backup file name to be restored in a file recovery area corresponding to the user.
The file management apparatus according to claim 4, wherein: In the backup management table, the file name of the deletion dummy file corresponding to the same target file name as the target file name corresponding to the backup file name to be restored is registered in the backup management table. If the update time corresponding to the file name is after the update time corresponding to the backup file name to be restored and before the file recovery target time, the backup file name is excluded from the restoration target.
6. The file management apparatus according to claim 4, wherein the file management apparatus is a file management apparatus. The table storage unit further stores a folder name change management table for managing the changed folder name,
The operation information indicates the type of folder operation, the update time of the folder, and the folder name to be operated,
The detection unit detects a change of the folder name based on the received operation information,
The backup file generation unit, when the change of the folder name is detected by the detection unit, the folder name of the folder name including the folder name change time, the folder name before change, and the folder name after change indicated by the operation information Write a change dummy file to the backup storage unit,
The retrieval unit further reads out the update time corresponding to the backup file name to be restored, and corresponds to the folder name change time after the read update time and before the restoration target time. When the folder name included in the file name is registered in the folder name change management table as the pre-change folder name, the post-change folder name corresponding to the pre-change folder name is read,
The restoration unit includes a file having a file name obtained by replacing the folder name before change in the target file name read by the search unit corresponding to the backup file name to be restored with the folder name after change. When generating in the recovery area and receiving an output instruction for the file generated in the file recovery area, the backup file with the backup file name to be restored is read from the backup storage unit and output.
The file management apparatus according to claim 4, wherein the file management apparatus is a file management apparatus. The backup generation unit
Read the folder name before change and the folder name change time from the folder name change management table,
For backup files corresponding to the same target file name from the backup file name whose update time is before the folder name change time and which includes the pre-change folder name, the file generation time is the most A backup file close to the time is extracted, and is further generated from the extracted backup file corresponding to the same target file name as the backup file, the file generation time is after the file generation time of the backup file, and the folder name Exclude backup files with delete dummy files that are before the modification time,
Copy the remaining excluded backup files, replace the pre-change folder name in the backup file name of the backup file with the post-change folder name, and write to the backup storage unit with the backup file name given a new child number In addition, a dummy file for deleting the target file corresponding to the remaining backup file excluded is generated and written to the backup storage unit,
The table management unit includes information that associates the backup file name of the backup file written by the backup generation unit into the backup storage unit, the target file name acquired from the backup file name, and the folder name change time. In addition to writing to the backup management table, the file name of the dummy file for deletion written to the backup storage unit by the backup generation unit, the target file name acquired from the file name, and the folder name change time are associated with each other Writing information to the backup management table;
The file management apparatus according to claim 7. Generate a backup management table including information that associates the backup file name of the backup file stored in the backup storage unit, the target file name acquired from the backup file name, and the creation time of the backup file A table recovery unit;
The file management apparatus according to claim 1, wherein the file management apparatus is a file management apparatus. The operation information indicates the type of folder operation and the name of the folder to be operated,
The detection unit detects a change of the folder name based on the received operation information,
The backup file generation unit, when the change of the folder name is detected by the detection unit, a folder name change dummy file including the folder name before change and the folder name after change indicated by the operation information in the backup storage unit writing,
The table restoration unit associates the folder name before change and the folder name after change indicated by the folder name change dummy file stored in the backup storage unit with the creation time of the folder name change dummy file. Create a folder name change management table that includes
The file management apparatus according to claim 9.   The file management apparatus according to claim 1, wherein the backup storage unit stores the backup file using a deduplication technique.

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