JP2587417B2 - File backup and restoration method - Google Patents

Description

The present invention relates to a file save / restore method for saving and restoring files in a file system of a computer.

[Conventional technology]

In a file system having a function of saving a file created in an external storage device to another external storage device and restoring the saved file to the original external storage device or another external storage device, There are a wide variety of supported programs.

For example, in the case of an evacuation function, a program for transferring a physical image (a track image in the case of a magnetic disk device) recorded in an external storage device to an external storage device for evacuation and a physical program recorded in the external storage device There is a program that extracts a logical record from a logical image and transfers it to an external storage device for evacuation. Further, in the restoration function, there is a program for restoring with a physical and logical image in accordance with the above-mentioned saving method.

From the viewpoint of processing efficiency, the method of evacuating with a physical image and restoring with a physical image is the most efficient, but this method requires that the external storage device in which the file to be evacuated is created and the file to be restored are When the physical attributes (track capacity in the case of a magnetic disk) of the included external storage device are equal, and the file attributes (block length, record length, etc.) of the file to be saved and the file to be restored are equal. If the physical attributes and file attributes are different, use a program that extracts a logical record from a physical image recorded in the external storage device and transfers it to the external storage device for evacuation. Files must be evacuated and restored using a logical image restoration program.
The processing efficiency is lower than when saving and restoring with a physical image. In recent years, data stored in computers has shifted from conventional numerical data to multimedia data, and various external storage devices have been prepared in hardware in response to this. The saving and restoring of files by logical images is becoming more and more common.

Conventionally, which program is executed when a file is saved and restored is determined by an operator in consideration of a physical attribute of an external storage device and a file attribute. That is, if the physical attributes and file attributes of the external storage device are the same, the physical image
An efficient program for restoring is executed, and when physical attributes and file attributes are different, a program for saving and restoring is executed by a logical image. And when saving files,
If it is not determined in advance where the file is to be restored, prepare a program for saving and restoring with a logical image in preparation for the possibility of restoring to an external storage device with different physical attributes and file attributes. I am trying to do it.

[Problems to be solved by the invention]

As described above, conventionally, the program executed at the time of saving and restoring is selectively used according to the physical attribute and the file attribute of the external storage device, so that the operation at the time of saving and restoring the file becomes cumbersome. If the location of the file to be restored is not determined, or if the physical attribute and file attribute of the external storage device are different, a program for saving and restoring by a logical image must be executed. Therefore, there is a problem that the processing efficiency is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to simplify operations for saving and restoring files and to efficiently save and restore files. Sometimes.

[Means for solving the problem]

The file save / restore device of the present invention saves a file created in a first external storage device to a second external storage device, and saves the file saved in the second external storage device to the first external storage device. In a file save / restore device for restoring to a device or a third external storage device, file attribute information of a file created in the first external storage device and physical attribute information of the first external storage device are stored from a management file. Attribute reading means for reading, first input means for reading the physical image of the file created in the first external storage device as it is, and physical image read by the first input means as it is. First output means for writing to the second external storage device together with the file attribute information and physical attribute information read by the attribute reading means in a form; and writing to the second external storage device Second input means for reading the physical image that has been written as it is and reading the file attribute information and the physical attribute information written together with the physical image; and the second input means. Compares the file attribute information of the file saved and the file attribute information of the file to be restored, and compares the physical attribute information of the first external storage device read by the second input unit with the file attribute information of the file to be restored. The file attribute of the file for restoring the physical image read by the second input means based on the comparison result is compared with the physical attribute information of the external storage device in which the file to be created is created, and the file to be restored Determining means for determining a conversion method for performing conversion so as to match the physical attribute of the external storage device to be created; and the second input means according to the determination result of the determining means. Conversion means for converting the physical image forme, and a second output means for outputting a physical image to an external storage device will be restored to the conversion result of the converting means.

(Operation)

When the file created in the first external storage device is saved, the file attribute information of the file and the physical attribute information of the first external storage device are also stored together with the physical image of the file in the second storage medium. Written to external storage. When restoring a file evacuated to the second external storage device, the determination unit compares the file attribute information of the evacuated file with the file attribute information of the file to be restored, and The physical attribute information is compared with the physical attribute information of the external storage device in which the file to be restored is created, and based on the comparison result,
Determining a file attribute of a file for restoring a physical image and a conversion method for converting the file to be restored to match the physical attributes of the external storage device in which the file is created,
The conversion means performs a conversion process according to the determination result of the determination means.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.
The file attribute information of the external storage device 2 and the physical attribute information of the external storage device 2 are stored in a file catalog created in the external storage device 1.
An attribute reading means 3 for reading from a management file such as 1a; a first input means 4 for reading data of the file 2a to be saved as a physical image as it is; a physical attribute read by the attribute reading means 3 Information, file attribute information and the data read by the input means 4 are written directly to the save medium 6
Output means 5, second input means 9 for reading physical attribute information 7 a, file attribute information 7 b and save data 8 written on save medium 6, and second input means 9 for reading The external storage device 1 read from the file attribute information 7b of the file 2a and the file catalog 14a created in the external storage device 14.
3 is compared with the file attribute information of the file 13a to be restored, the physical attribute information 7a of the external storage device 2 and the external storage device 1 read from the file catalog 14a.
A determination unit that compares the physical attribute information with the physical attribute information and outputs a conversion instruction according to the comparison result; and a conversion unit that converts and outputs the save data according to the content of the conversion instruction added from the determination unit. Means 11 and the output of the conversion means 11 to an external storage device 13
And second output means 12 for writing to

Next, the operation of FIG. 1 will be described. In this embodiment, the file attribute information indicates the file organization, block length, and record length.

The first input unit 4 reads the data of the file 2a to be saved created in the external storage device 2 as a physical image as it is, and the attribute reading unit 3 reads the physical attribute of the external storage device 2 from the file catalog 1. Information and file 2a
Read the file attribute information of The first output means 5 is
The save data read by the input means 4 is written to the save medium 6 as it is, and the physical attribute information and the file attribute information read by the attribute read means 3 are written to the save medium 6.

When restoring a file, the second input means 9 applies the physical attribute information 7a, the file attribute information 7a and the file attribute information 7b from the save medium 6 to the determination means 10, and adds the save data 8 to the conversion means 11.

The judging means 10 includes physical attribute information 7a and file attribute information
When 7b is added, the processing shown in the flowchart of FIG. 2 is started. That is, the determination unit 10 first checks whether the file organization of the saved file 2a and the file organization of the restored file 13a match by comparing the file attribute information of the files 2a and 13a (step 21). ),
If the file organization is the same, it is checked whether or not the block length and the record length of the files 2a and 13a are equal by comparing the file attribute information of each of the files 2a and 13a (step 22). If the file organization does not match, it cannot be restored.

If it is determined in step 22 that both the block length and the record length of the files 2a and 13a are equal, it is determined whether the physical attributes of the external storage devices 2 and 13 match (step 23). If it is determined that the physical attributes do not match, it is determined that the save data 8 needs to be physically converted, and a physical conversion instruction is added to the conversion means 11 (step 25). If it is determined that the conversion is performed, it is determined that there is no need to perform any conversion on the save data, and a non-conversion instruction is added to the conversion means 11 (step 24). If the determination result of step 22 is NO, that is, if at least one of the block length and the record length is different, it is necessary to perform a logical conversion on the save data 8. Then, a logical conversion instruction is added to the conversion means 11 (step 26).

The conversion means 11 performs the processing shown in the flowchart of FIG. 3 when a logical conversion instruction, a physical conversion instruction, or a non-conversion instruction is added from the determination means 10.

In steps 31 and 32, the conversion means 11 determines whether the instruction from the determination means 10 is a logical conversion instruction, a physical conversion instruction, or a non-conversion instruction, and distributes the conversion work. Logical conversion is performed in steps 33 to 35. Step 33
Then, a process of extracting a block image from the physical image of the saved data 8 and extracting a logical record from the block image is performed. In step 34, the logical records are stored in accordance with the block length of the file 13a to be restored, and when the blocks are full, the process of storing the records in the next block is performed for all the logical records extracted in step 33. If the record length of the file 2a is different from the record length of the file 13a, the process of matching the record length of the logical record extracted in step 33 with the record length of the file 13a is performed, and then the process of storing the record in the block If the record length of the file 2a is shorter, a predetermined value is added to the logical record extracted in step 33, the record length is made to match the record length of the file 13a, and then stored in a block. If the record length of the file 2a is longer than that of the file 13a, the trailing item or the separately designated item which cannot store the logical record item extracted in step 33 is deleted, and the record length of the file 13a is deleted. After matching the record length,
This is to perform processing for storing in a block. Steps
In step 35, a process of creating and outputting a physical image (or a track image in the case of a magnetic disk device) for the external storage device 13 by continuously arranging the blocks created in step 34 is performed. If it is determined in step 32 that the instruction from the determination means 10 includes a physical conversion instruction, the extracted block image is arranged according to the physical image of the restoration device (step 36). In any of the above cases, the capacity of the restoration destination file 13a is larger than that of the file 2a.
When the capacity is larger than the capacity, an empty image is created in the surplus block. In addition, the conversion means 11
If it is determined in step 31 that the instruction from the determination means 10 is a non-conversion instruction, the save data 8 from the second input means 9 is output as it is (step 37).

FIG. 4 is a diagram showing an example of the logical conversion performed by the conversion means 11. Now, for example, one unit of the physical image in the save data 8 is composed of two blocks B1 and B2 as shown in FIG. 3A, and each block B1 and B2 has four logical records. Assume that R1 to R4 and R5 to R8 are stored, and one unit of the physical image of the external storage device 13 at the restoration destination is composed of four blocks B'1 to B'4. Assuming that two logical records are stored in B'4, the processing of step 34 is performed, and as shown in FIG.
R1 and R2 are stored, and logical records R3 and R4 are stored in block B'2.
Are stored in the block B'3, the logical records R5 and R6 are stored in the block B'3, and the logical records R7 and R8 are stored in the block B'4. It is output in the order of B'3, B'4.

FIG. 5 is a diagram showing an example of the physical conversion performed by the conversion means 11. Now, for example, one unit of the physical image in the save data 8 is composed of three blocks B1, B2, B3 as shown in FIG.
Has three records R1 to R3, R4 to R6, and R7 to R9, respectively, and the capacity per unit of the physical image of the external storage device 13 at the restoration destination is the capacity to store two blocks. If the conversion means 11 has only one physical image in the external storage device 13,
As shown in the figure, only blocks B1 and B2 are output and block B
3 is output for the next unit.

〔The invention's effect〕

As described above, according to the present invention, when a file is saved, the file attribute information of the file and the physical attribute information of the external storage device in which the file is created are also saved, and the file is restored. At this time, the physical image of the file saved based on the file attribute information, the file attribute information of the file to be restored, the physical attribute information, and the physical attribute information of the external storage device in which the file to be restored is created. Is determined in accordance with the result of the determination, and the same program is used regardless of whether the file attributes and physical attributes of the save source and the restore destination are the same or different. Files can be saved and restored, and different programs must be used depending on the physical attributes of external storage devices and file attributes. Compared to the conventional example was not saving the file, there is an effect that can be made easy restoration work. Further, according to the present invention, when a file is saved, the file is always saved as it is as a physical image, so that there is an effect that the processing efficiency can be increased as compared with the conventional example.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing contents of the judging means 10, FIG. 3 is a flowchart showing the processing contents of the conversion means 11, and FIG. FIG. 5 is a diagram showing an example of physical conversion. 1, 2, 13, 14 ... external storage device, 1a, 14a ... file catalog, 2a, 13a ... file, 3 ... attribute reading means, 4 ...
... First input means, 5... First output means, 6... Save medium, 7a... Physical attribute information, 7b... File attribute information, 8. Means, 10 ……
Determination means, 11 conversion means, 12 second output means;

Claims (1)

(57) [Claims] A file created in a first external storage device is saved in a second external storage device, and a file saved in the second external storage device is saved in the first external storage device or the third external storage device. A file save / restore device for restoring the file in the external storage device, wherein the attribute reading of reading the file attribute information of the file created in the first external storage device and the physical attribute information of the first external storage device from the management file Means, first input means for reading a physical image of a file created in the first external storage device as it is, and the attribute as the physical image read by the first input means as it is A first output unit that writes the file attribute information and the physical attribute information read by the reading unit into the second external storage device; and a physical image that is written into the second external storage device. A second input means for reading the file attribute information and the physical attribute information written together with the physical image while reading the page as it is, and the second input means The file attribute information of the saved file is compared with the file attribute information of the file to be restored, and the physical attribute information of the first external storage device read by the second input means and the file to be restored are compared. A file attribute of the file for restoring the physical image read by the second input means and a file for restoring the file are created based on the comparison result with the physical attribute information of the external storage device to be created. Determining means for determining a conversion method for performing conversion so as to match the physical attribute of the external storage device, and a physical image read by the second input means in accordance with the determination result of the determining means. Conversion means for converting the di-, file saving and restoration apparatus which comprises a second output means for outputting a physical image conversion result of the converting means to restore the external storage device.