JPH086827A - System and method for file storage - Google Patents

Abstract

PURPOSE:To enable flexible adaption to the capacity of a secondary storage medium where data are stored by dividing a generated file into plural files when the file contents in a volume are all updated. CONSTITUTION:The maximum file size of a file that can be stored on a flexible disk drive 4 is stored in the management file 31 on a magnetic disk drive 3. When the system is started up, the management file 31 is read out and stored in the management table 55 of a central processor 5. While the system is in on-line service, a file calculation part 53 divides data to be saved into plural parts corresponding to file information obtained on the basis of the maximum file size. A file write part 54 writes the data, divided by the file calculation part 53, in data files A and B on the magnetic disk drive 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file saving system and method for saving data in a file in an electronic exchange or the like, and more particularly to a system and method for dividing and managing one logical file into a plurality of files.

[0002]

2. Description of the Related Art Conventionally, in this type of file management, as described in Japanese Patent Laid-Open No. 4-287140, a logical file is created when a record is added to a file in a volume. One logical file is divided into a plurality of physical files according to the number of records to be added, and the divided physical files are allocated to a plurality of volumes.

[0003]

In the conventional file management described above, only one logical file is created for a file already created in the volume and additional writing of a record is performed. The logical file is divided into multiple physical files, and this is not applicable to the case where a new file is created each time, that is, all the contents of the file in the volume are updated, as in the case of a storage program control type exchange. There is a drawback that.

Further, in the above-mentioned publication, the method of writing the file management information file describing the maximum number of records of one file into the volume is not clearly stated.
It is impossible to flexibly adapt to the capacity of the storage medium for storing data without knowing how to change the maximum number of records.

An object of the present invention is that, when all the file contents in a volume are updated, the generated file can be divided into a plurality of files, and the capacity of the secondary storage medium for storing data can be flexibly dealt with. A file storage system and method are provided.

[0006]

A file storage system of the present invention includes a main storage device for storing programs and data for controlling an exchange, a first external storage device for storing the data, and the first external storage device. A second external storage device for reading data stored in the storage device, and a central interface for performing an exchange operation by the program read from the main storage device to interface with the first and second external storage devices. In a storage program control type exchange equipped with a processing device and a maintenance terminal for operation input, the central processing unit is set in the second external storage device in advance by an operation input from the maintenance terminal. A means for reading the maximum file size that can be stored in the second external storage device and storing it in the management file of the first external storage device, and starting up the system. Means for reading the contents of the management file and storing it in the management table of the central processing unit, and the data stored in the main memory during the online service of the system based on the maximum file size. It is provided with a unit that divides the file information into a plurality of files corresponding to the obtained file information and writes the data as a data file in the first external storage device.

The file saving method of the present invention is the first
An external storage device and a second external storage device for reading data stored in the first external storage device,
In a file saving method for an exchange that saves data under the control of a central processing unit, the maximum file size that can be saved in the second external storage device set in advance in the second external storage device is read out by an operation input, It is stored in the management file of the first external storage device, and when the system is started up, the contents of the management file are read out, stored in the management table of the central processing unit, and saved during the online service of the system. Power data is divided into a plurality of pieces corresponding to the file information obtained based on the maximum file size, and is written as a data file in the first external storage device. The maximum block that can be stored in one file The number and block size are defined in advance, and when saving data, the size of all data to be saved After dividing by the size to calculate the total number of blocks, divide the total number of blocks by the maximum number of blocks to calculate the required total number of data files and the number of blocks for each data file. When the calculated number of blocks of the first data file is reached, this data file is closed, "1" is subtracted from the number of said data files, and if there are remaining data files, a new data file is generated, The writing of the remaining blocks is continued by the number of blocks of this new data file.

[0008]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a file storage system of the present invention, which is illustrated as being applied to an electronic exchange. Referring to FIG. 1, the present invention relates to a maintenance terminal 1 having a keyboard and a display device for operation input, a main storage device 2 for storing a program (not shown) for controlling an exchange and data 21, and a data 21. A magnetic disk device 3 as a primary storage medium for storing data, and a flexible disk device 4 as a secondary storage medium for backing up the magnetic disk device 3 and for reading data stored in the magnetic disk device 3.
There is provided a central processing unit 5 for performing an exchange operation by a program read from the main storage unit 2 and for interfacing with the magnetic disk unit 3 and the flexible disk unit 4.

The magnetic disk device 3 includes a management file 31 for storing the maximum number of blocks and a block size of one block read from the flexible disk device 4, a data file A 32 for storing the data 21 as a file, And a data file B33. The number of data files is an example and is not limited to this example.

The central processing unit 5 has a control section 5a and a storage section 5b, and the control section 5a has a file installation section 51, a file reading section 52, and a file number calculation section 53.
And a file writing unit 54.

The file installation unit 51 reads the maximum file size that can be stored in the flexible disk device 4 and is stored in the management file 31 in advance by the operation input from the maintenance terminal 1.
The file reading unit 52, when starting up the system,
The contents of the management file 31 are read out and stored in the management table 55 of the central processing unit 5. The file number calculation unit 53
The system divides the data 21 stored in the main storage device 2 during the online service into a plurality of pieces corresponding to the file information obtained based on the maximum file size. The file writing unit 54 writes the divided data 21 in the magnetic disk device 3 as a data file.

The storage unit 5b comprises a management table 55 and a file information table 56. Management table 55
2 is composed of the maximum number of blocks 61 that can be stored in one file and the block size 62 of one block, as shown in FIG. For example, when a flexible disk device (FDD) of 1 megabyte is used as a secondary storage medium, a maximum of 256 pieces of data having a block size of 4 kilobytes can be stored by 1024/4 = 256. By the operation input of, the maximum number of blocks is set to 256, and the block size is set to 4 kilobytes.

As shown in FIG. 3, the file information table 56 includes a total number of blocks 71 indicating the total number of blocks, a total number of files 72 indicating the total number of files, and a file number "N" indicating the number of blocks stored in each file. Of the number of blocks 73 and 74
Each value is calculated and set by 3. For example, when the data is 2 megabytes and the above FDD is used, the total number of blocks is 2048/4 = 512, and the maximum number of blocks per file is 256. Therefore, the total number of files is 512/256 = 2. It becomes 2. The number of blocks for each file is 256 for file number 1 and 256 for file number 2.

Next, the operation of this embodiment will be described with reference to FIGS.

In response to an operation input from the maintenance terminal 1, the file installation section 51 receives information regarding the maximum number of blocks and block size of one file (step 1: S1), and the information is stored in the flexible disk device 4. Store (S2). File installation unit 51
In accordance with an instruction from the maintenance terminal 1, reads the information stored in S1 in the flexible disk device 4 and writes it in the management file 31 of the magnetic disk device 3 (S3).

When the system is started up, the file reading section 52 reads the management file 31 (S4) and creates the management table 55 (S5). File number calculation unit 53
Detects the total data size of the data 21 and divides this by the preset block size to obtain the number of blocks (S6). Further, the total number of blocks is divided by the maximum number of blocks to obtain the total number of files and the number of blocks for each file (S7). The file number calculation unit 53 stores the total number of blocks, the total number of files, and the number of blocks for each file obtained in S7 in the file information table 56 (S
8).

The file writing unit 54 creates a data file A32 in the magnetic disk device 3 (S9), and based on the file information table 56, continuously writes the data 21 in block size units to the data file A32. (S10). It is determined whether or not the number of blocks to be written has reached the specified number (S11), and when it reaches the number, the data file A32 is closed (S12), and "1" is subtracted from the total number of files (S13). It is determined whether or not there is a remaining file to be generated (S14), and if there is, a new file, the data file B32 in this embodiment is generated, and the writing of the remaining blocks to the new file is continued (S14).
16).

When the writing of all files is completed, the file saving of the file writing unit 54 is completed. Thereafter, the data saved in the data file is divided and saved in the flexible disk device 4 by a save command from the maintenance terminal 1 to the flexible disk, if necessary.

When the file size is changed in order to match the capacity of the new storage medium, the maintenance terminal 1 operates the newly provided storage medium in the same procedure as described above to store the data in the magnetic disk device 3. This is performed by instructing to change the information (maximum file size and block size) in the management file 31.

As described above, the data can be divided and saved according to the storage capacity of the secondary storage medium, and the file can be saved with higher flexibility.

[0021]

As described above, according to the present invention, the maximum file size that can be stored in the second external storage device is stored in the management file of the first external storage device, and the system is started up. At the same time, the contents of the management file are read and stored in the management table of the central processing unit, and the data to be saved is divided into multiple pieces according to the file information obtained based on the maximum file size while the system is online service. However, when all the file contents in the volume are updated by writing as a data file in the first external storage device, the generated file can be divided into multiple files, and the capacity of the secondary storage medium for storing the data. Can be flexibly dealt with.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a file storage system of the present invention.

FIG. 2 is a diagram showing a configuration example of a management table in FIG.

3 is a diagram showing a configuration example of a file information table in FIG.

FIG. 4 is a flowchart showing a processing procedure of an embodiment of a file saving method of the present invention.

FIG. 5 is a flowchart showing a processing procedure of an embodiment of a file saving method of the present invention.

FIG. 6 is a flowchart showing a processing procedure of an embodiment of a file saving method of the present invention.

[Explanation of symbols]

 1 Maintenance Terminal 2 Main Storage Device 3 Magnetic Disk Device 4 Flexible Disk Device 5 Central Processing Unit 21 Data 31 Management File 32 Data File A 33 Data File B 51 File Installation Section 52 File Reading Section 53 File Count Calculation Section 54 File Writing Section 55 management table 56 file information table 5a control unit 5b storage unit

Claims (3)

[Claims] 1. A main storage device for storing a program and data for controlling an exchange, and a first storage device for storing the data.
External storage device, a second external storage device for reading the data stored in the first external storage device, and a program read from the main storage device to perform an exchange operation. In a storage program control type exchange equipped with a central processing unit for interfacing with an external storage device and a maintenance terminal for operation input, the central processing unit is configured in advance by the operation input from the maintenance terminal. Means for reading the maximum file size that can be stored in the second external storage device set in the second external storage device and storing it in the management file of the first external storage device; A means for reading the contents of the management file and storing it in the management table of the central processing unit, and a means for storing it in the main storage device while the system is online. Existing data is divided into a plurality of pieces corresponding to the file information obtained based on the maximum file size, and is written into the first external storage device as a data file. . 2. A first external storage device and a second external storage device for reading the data stored in the first external storage device, and the data is stored under the control of the central processing unit. In the file storage method in the exchange, the maximum file size that can be stored in the second external storage device, which has been set in advance in the second external storage device by operation input, is read out and stored in the management file of the first external storage device. When the system is started up, the contents of the management file are read out and stored in the management table of the central processing unit, and the data to be saved is stored based on the maximum file size while the system is online service. A method for storing a file, characterized in that the file is divided into a plurality of pieces corresponding to the file information obtained in (1) and written as a data file in the first external storage device. . 3. The maximum number of blocks that can be stored in one file and the block size are defined in advance, and when data is saved, the size of all data to be saved is divided by the block size to obtain all blocks. After calculating the number, the total number of blocks is divided by the maximum number of blocks to calculate the required total number of data files and the number of blocks for each data file, and the number of write blocks of the first data file is calculated. When the number of blocks is reached, this data file is closed and "1" is added from the data file number.
3. The file saving method according to claim 2, wherein when the data file is subtracted, a new data file is generated and writing of the remaining blocks is continued by the number of blocks of this new data file. .