JPH0535567A - System for file recovery in fault occurrence - Google Patents

Abstract

PURPOSE:To make a recovery to the latest state even if fault occurs to a file storage device by backing up the contents of updated files on an external storage device when files are outputted to a file storage device. CONSTITUTION:A file backup processing means 5 backs up all files on a subordinate file storage device 9 periodically from the file storage device 8 and an external storage device file deletion processing means 6 deletes all the files on the external storage device 10 except the updated files. Further, an updated file backup processing means 3 outputs only the updated files to the external storage device 10 at the update timing of the files. If fault occurs to the file storage device 8, a file recovery processing means 7 copies all the contents of the subordinate file storage device 9 to the file storage device 8 after the fault is removed and then copies the contents of the external storage device 10 to the file storage device 8. Consequently, the file storage device 8 can be restored to the state right before the fault occurrence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file management system, and more particularly to a file recovery system when a failure occurs in a file storage device.

[0002]

2. Description of the Related Art Conventionally, this type of file recovery method has only periodically backed up the entire file storage device.

[0003]

Since the conventional file recovery method described above only backs up the entire file storage device on a regular basis, when a failure occurs in the file storage device, only the stage at which the backup is acquired is obtained. The file could not be recovered.

[0004]

According to the present invention, there is provided a file recovery processing means upon occurrence of a failure in a file storage device which regularly backs up the entire file device to a secondary file storage device by a file backup process. When an error occurs and the file is restored, the updated file backup processing means that always backs up the updated file to the external storage device, and the external storage device that deletes all files other than the updated file when executing the file backup process It has a storage device file deletion processing means and a file restoration processing means for restoring a file by referring to the sub file device and the external storage device when a failure occurs.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, which is a file output process 1, a file output process means 2, an update file backup process means 3, a file backup process 4, a file backup process means 5 and an external device. Storage device file deletion processing means 6, file restoration processing means 7, file storage device 8, and secondary file storage device 9
And the external storage device 10.

Next, the operation of each device of this embodiment will be specifically described.

The file output processing 1 is called when a new file is created in the file storage device 8 and when a part of the file is modified, and the file output processing means 2
And the update file backup processing means 3 are sequentially called.

The file output processing means 2 actually updates the file storage device 8 according to the information from the user, and transfers control to the updated file backup processing means 3.

The update file backup processing means 3 is
Read the updated file from the file storage device 8,
A process of storing this in the external storage device 10 is performed.

The file backup processing 4 is called periodically to back up the entire file, and the file backup processing means 5 and the external storage device file deletion processing means 6 are called in order.

The file backup processing means 5 actually performs a processing of backing up all the files in the file storage device 8 to the secondary file storage device 9, and transfers control to the external storage device file deletion processing means 6.

The external storage device file deletion processing means 6 is
When the file backup processing means 5 is executed, processing for deleting all files in the external storage device 10 is performed.

When a failure occurs in the file storage device 8, the file restoration processing means 7 is started after solving the cause of the failure, and the file backup processing means 5 causes the file backup processing means 5 to back up the file storage device 8 as a secondary file. After copying all the files in the storage device 9 to the file storage device 8, the file backup processing 4
By copying the file in the external storage device 10 stored by the update file backup processing means 3 to the backup of the file updated after the processing of the external storage device file deletion processing means 6 to the file storage device 8 To recover the latest files.

The file storage device 8 is updated by the file output processing means 2 and the file restoration processing means 7 and is referred to by the file backup processing means 5, and stores files directly used by the user.

The sub-file storage device 9 is updated by the file backup processing means 5 and is referred to by the file restoration processing means 7. The contents of the file storage device 8 when backed up by the file backup processing means 5 last time. Is stored.

The external storage device 10 is updated by the updated file backup processing means 3, and the file restoration processing means 7 is executed.
And is deleted by the external storage device file deletion processing means 6, and the previous file backup processing means 5 is used.
All files in the file storage device 8 that have been updated after being backed up are stored. External storage device 10
May be a magnetic disk device, a magnetic tape device, or an optical disk device. When the sub file storage device 9 is a magnetic disk device or an optical disk device, the sub file storage device 9 and the external storage device 10 can be realized as the same type of device.

Next, the overall operation of this embodiment will be specifically described.

The file backup processing 4 is called periodically, and the file backup processing means 5 transfers all the files in the file storage 8 to the secondary file storage 9.
Backup process to the secondary file storage device 9
Has become the latest state of the file storage device 8, so the external storage device 1 is deleted by the external storage device file deletion processing means 6.
Delete all files in 0.

The file output processing 1 is called at the timing when the user updates the file, and the file output processing means 2 actually updates the file storage device 8.
The updated file backup processing means 3 outputs only the updated file to the external storage device 10. As a result, the external storage device 10 stores only the changes between the file storage device 8 and the sub-file storage device 9.

When a failure occurs in the file storage device 8, after the failure is resolved, the file recovery processing means 7 first copies all the sub-file storage devices 9 to the file storage device 8, and then stores the external storage device 10 in the file storage. By copying to the device 8, the file storage device 8 can be restored to the state just before the failure.

[0022]

As described above, according to the present invention, the backup of the updated file is stored in the external storage device so that the file can be restored to the latest state even if a failure occurs in the file storage device. effective.

[Brief description of drawings]

FIG. 1 is an example of the present invention.

[Explanation of symbols]

 1 File output processing 2 File output processing means 3 Update file backup processing means 4 File backup processing 5 File backup processing means 6 External storage device File deletion processing means 7 File restoration processing means 8 File storage device 9 Secondary file storage device 10 External storage device

Claims (1)

Claim: What is claimed is: 1. When a file storage device that regularly backs up the entire file device by a file backup process backs up the entire file to a secondary file storage device fails and the file is restored, the update is performed. Update file backup processing means that always backs up the created files to the external storage device, external storage device file deletion processing means that deletes all the files in the external storage device other than the updated files when executing the file backup processing, and a failure occurs. In the event of a failure, a file recovery processing means for recovering a file by referring to the secondary file device and the external storage device is provided.