JPS6188348A - File back-up system of shared file system - Google Patents

Abstract

PURPOSE:To restore a file to the state before starting using even when abnormality occurs while the system is in use by making back-up of a file in renewal automatically just before starting use of a file in common use and just after finishing of use. CONSTITUTION:A main memory 2 stores files being processed by single or plural computers, and an auxiliary memory 6 is provided with a present file storing area, an initial state file storing area and an intermediate state file storing area. A file controlling device 10 provided with a transferring circuit 8 that transfer files stored in the device 2 to the device 6 is provided. When access is made first from a computer to the file, this device 10 transfers the file to a file storing area 5 in the initial state of the device 6. Every time access is made from the computer to the same file, and every time processing of the same file is completed by the computer, the device 10 transfers the file on the device 2 to present file storing area, and transfers the file in the present storing area to the file storing area of intermediate processing state successively.

Description

DETAILED DESCRIPTION OF THE INVENTION 1) Technical Field of the Invention The present invention relates to a network system in which a plurality of relatively small information processing apparatuses such as personal combinators are connected, in which the plurality of information processing apparatuses use the same file. This is related to the backup method for common files when stirring crops.

2) Problems with the conventional technology The backup method in conventional network systems is to create a backup file when each information processing device finishes processing files that are commonly used within the system, and then A file consisting of data was stored interchangeably with the original file.

However, with this type of system, if an accident occurs during the process even though multiple information processing devices have made many (Ii) positive changes over a long period of time, the progress will not be backed up at all. This has the disadvantage that all information processing devices have to go back to the initial state of the file and redo any modifications or changes.

3) Purpose of the Invention In view of the above drawbacks, the purpose of the present invention is to automatically back up the latest data that is being updated as much as possible even when multiple information processing devices update the same file at the same time, and to The present invention provides a backup method that allows files to be restored to the state before use of the information processing apparatus in the event of an abnormality, and even in the worst case, to restore the original files to the original files at the time of system startup.

4) Structure of the Invention The object of the present invention is to provide a shared file system in which a plurality of TG machines connected via a network simultaneously use and update the same file, which includes input/output means for the plurality of computers, and a single or main storage means for storing files being processed by a plurality of lr machines, 1lff auxiliary storage means comprising a current file storage area, an initial state file storage area, and an intermediate processing state file storage area, and the computer. The file control means includes a file processing detection means for detecting whether or not the files are processing the same file, and a transfer means for transferring the file stored in the main storage means to the auxiliary storage means, the file control means transfers the file to the initial state file storage area of the auxiliary storage means when the computer first accesses the file, and transfers the file to the initial state file storage area of the auxiliary storage means, and transfers the same file in the computer each time the computer accesses the same file. A file of a shared file system characterized in that each time processing of a file is completed, a file in the main memory is sequentially transferred to the current file storage area, and a file in the current storage area is transferred to the file storage area in an intermediate processing state. This is accomplished through a backup method.

5) Examples of the invention The present invention will be described in detail below with reference to Examples.

FIG. 1 is a block diagram showing an example of an apparatus for implementing the present invention;
Figure 2 is a flowchart showing the processing flow of the device in Figure 1;
Figures (A) to (I) are explanatory diagrams showing the state of backup, in which 1 is the input/output section, 2 is the main memory, 3 is the current file storage area, 4 is the file storage area in the intermediate processing state, 5 is the file storage area in the initial state, 6 is the auxiliary storage, 7 is the file processing detection unit, 8 is the transfer unit, 9 is the update detection unit, 10 is the file control unit, 11 is the main device, 12 is the exchange, and 13 is multiple This is an information processing device.

The above device operates as follows. First, Figure 3 (A)
As shown in the figure, when there is no user in the information processing device 13.13, the file AAA is stored in the current file storage area 3 of the auxiliary storage device 6, and its contents are shown in (a) in the 6th order ft53 diagram. As shown in CB), when user a attempts to open the file AAA in the main device 11 via the network and update its contents, the 7-isle processing detection unit 7 in FIG. 1 prohibits the update of the file AAA. , the transfer unit 8 transfers the file to the file storage area 5 in the initial state of the auxiliary storage 6, and A A A , ba
Save as cku p (a). At the same time, the contents of the file AAA are loaded onto the main entry t2. FIG. 3C shows a state in which the prohibition on file updates has been lifted and the user has added data (i). Then, when the user attempts to update the file AAA via the network in the same way as above, updating of the file AAA is temporarily prohibited as before.
The transfer unit 8 transfers the file AA in the current file storage area 3.
A (A) is transferred to the file storage area 4 in the intermediate processing state, and the storage content (Ai) on the main memory is stored in the current file storage area 3 as AAA (Ai). This state is the third
vIs diagram (E) shows a state in which the update prohibition of file AAA shown in diagram (D) has been lifted and both users a and b have updated file AAA and added data (c).

When the user finishes updating the file AAA, the update of the file AAA is prohibited again, and the file AAA in the current file storage area 3 is transferred to the file storage area 4 in the intermediate processing state and AAA, 5cratch (ai).
The data on the main memory is transferred to the current file storage area 3 and saved as AAA. This state is shown in FIG. 3(F). This process is shown in Figure 13 (E
), a third user C attempts to update file A A A, and the same situation occurs for him as well, and this is shown in Figure 3 (I).
Shown below.

From the state shown in FIG. 3(F), user a adds data (E), and the first state is shown in FIG. 3(G), and the state in which the file update has been completed is shown in FIG.

6) Effects of the invention As is clear from the detailed explanation above, Net!
・To automatically back up files that are being updated immediately before and after users of multiple information processing devices connected by a network start using a shared file and immediately after finishing using it. Even if an error occurs while using the system, the user can restore the 7γ file to the state before the start of use, and there is no need to repeatedly update the file from the initial state as in the past. The effect is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an apparatus for implementing the present invention;
! Figure 2 is a flowchart showing the processing flow of the apparatus in Figure 1, and Figure 3 (A)'=(I) is an explanatory diagram showing the backup state. Input/output unit, 2: Main memory, 3: Current file storage area, 4: File storage area in intermediate processing state, 5: File storage area in initial state, 6: Auxiliary memory, 7: File processing detection unit, 8 : Transfer unit, S: Update detection unit, 10: File control unit, 11: Main device, 12: Exchange unit, 13: Multiple information processing devices. 2:・“、′・・h AJc Jinto Patent Attorney Four Matsuda A-[-cost (E) (L/) +i', r l-ru old

Claims (1)

[Claims] A shared file system in which multiple computers connected via a network use and update the same file at the same time, and includes an input/output means for the multiple computers and a main memory that stores files being processed by one or more computers. means and
Auxiliary storage means having a current file storage area, an initial state file storage area, and an intermediate processing state file storage area, a file processing detection means for detecting whether the computer is processing the same file, and a main memory. The file control means includes a transfer means for transferring a file stored in the means to the auxiliary storage means, and the file control means transfers the file to the auxiliary storage means when the file is first accessed from the computer. At the same time, each time the computer accesses the same file and each time the computer finishes processing the same file, the file in the main memory is transferred to the current file storage area. , a file backup method for a shared file system characterized by sequentially transferring files in a current storage area to a file storage area in an intermediate processing state.