JPH0452724A - Input/output processing system for data saving device - Google Patents

Abstract

PURPOSE:To improve the independence between a data saving/restoring program and a data saving device by using an input/output filter program for data saving device corresponding to the data input/output system of the data saving device to perform the data input/output processing to the data saving device. CONSTITUTION:A data input/output control means 1 is provided together with a data saving device information acquiring means 2, a filter starting means 3, a data output means 4, a data input means 5, one or more data saving device input/output filter programs 6, and one or more data saving devices 7. These means 1 - 5 are built into a data saving/restoring program, and a filter independent of the data saving/restoring program and the device 7 is constructed by one or more programs 6. Thus the independence is improved between the data saving/restoring program and the device 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to data input/output processing for a data saving device (such as an IT! tape device or a floppy disk device) used for saving/restoring database data. The present invention relates to a data saving device input/output processing method for controlling a data saving device.

[Conventional technology]

Conventionally, this type of data backup device input/output processing method has been realized by being completely incorporated into a data backup/restore program that inputs/outputs database data.

Data saving devices include data saving devices that perform data input/output using blocking, data saving devices that perform data input/output using streams, and the like.

Conventional data evacuation device input/output processing methods, when targeting multiple data evacuation devices with different data input/output methods, require a data input/output means (data evacuation/restore program) corresponding to each data input/output method. The data saving device (means incorporated in the data saving device to perform data input/output processing to the data saving device), switches to the corresponding data input/output means based on the identification of the data input/output method, Data input/output processing was performed for each data backup device.6 Note that the method for switching data input/output means is to automatically identify the data backup device to be processed within the data backup/restore program and switch. There are two methods: one method that performs processing, and another method that performs switching based on the user's designation of the data backup device to be processed.

[Problem to be solved by the invention]

In the conventional data evacuation device input/output processing method described above, all data evacuation device input/output processing methods including data input/output means for the data evacuation device related to various data input/output methods are incorporated into the data evacuation/restore program. Therefore, if the data input/output method of a data backup device is changed, the entire data backup/restore program must be rewritten to change the data input/output method for that data backup device. There is a drawback.

Also, for the same reason, when a new data backup device that uses a new data input/output method is installed, it is necessary to create a new data backup/restore program that adds data input/output means for the data backup device. There is a drawback.

In view of the above-mentioned points, an object of the present invention is to change the data input/output method of a data backup device or to support a data backup device with a new data input/output method. It is an object of the present invention to provide a data saving device input/output processing method that can cope with the problem without any influence.

[Means to solve the problem]

The data evacuation device input/output processing method of the present invention is a data evacuation device input/output processing method that performs data input/output processing to a data evacuation device used for saving/restoring database data. A data evacuation device input/output filter program that is interposed between the two, independent of the evacuation device, and writes output data to a corresponding data evacuation device and reads input data from the corresponding data evacuation device; and a data evacuation device. Start the corresponding data evacuation device input/output filter program using the data evacuation device information acquisition means in the data evacuation/restore program that acquires the information and the data evacuation device information acquired by this data evacuation device information acquisition means. a data output means in a data evacuation/restore program that passes output data to the data evacuation device to the data evacuation device input/output filter program corresponding to the data evacuation device; A data input means in a data evacuation/restoration program that receives input data from a data evacuation device from the data evacuation device input/output filter program corresponding to the data evacuation device, and for performing data input/output processing to the data evacuation device. It has data input/output control means in a data save/restore program that controls the data save device information acquisition means, the filter activation means, the data output means, and the data input means.

[Effect]

In the data evacuation device input/output processing method of the present invention, a data evacuation device input/output filter program interposed between the data evacuation/restoration program and the data evacuation device independently of the data evacuation/restoration program and the data evacuation device outputs data to the corresponding data evacuation device. The input data is written and read from the corresponding data evacuation device, the data evacuation device information acquisition means in the data evacuation/restoration program acquires the data evacuation device information, and the filter activation means in the data evacuation/restoration program saves the data. The data evacuation device information acquired by the evacuation device information acquisition means is used to start the corresponding data evacuation device input/output filter program, and the data output means in the data evacuation/restoration program outputs the data to the data evacuation device. is passed to the data evacuation device input/output filter program corresponding to the data evacuation device, and the data input means in the data evacuation/restoration program passes the input data from the data evacuation device to the data evacuation device input/output filter program corresponding to the data evacuation device. Received from the program, the data input/output control means in the data save/restore program controls the data save device information acquisition means, filter activation means, data output means, and data input means to perform data input/output processing to the data save device. do.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the data saving device input/output processing method of the present invention.

The data backup device input/output processing method of this embodiment includes a data input/output control means 1, a data backup device information acquisition means 2,
It is configured to include a filter activation means 3, a data output means 4, a data input means 5, one or more data saving device input/output filter programs 6, and one or more data saving devices 7.

Here, data input/output control means 1. Data backup device information acquisition means 2. Filter activation means 3. The data output means 4 and the data input means 5 are incorporated into the data save/restore program. Further, one or more data evacuation device input/output filter programs 6 constitute a filter that is independent of the data evacuation/restoration program and the data evacuation device 7. Furthermore, each data saving device 7 corresponding to each data saving device input/output filter program 6
Each data evacuation device medium is present (set) in the .

FIG. 2 is a flowchart showing the processing of the data input/output control means 1. This process includes a data backup device information acquisition means execution step 201 and a data processing type determination step 202.
, output mode data saving device input/output filter program start step 203 , and output data acquisition step 20
4, output data existence determination step 205, data output means execution step 206, and output end notification step 2
07, input mode data saving device input/output filter program activation step 208, data input means execution step 209, input data existence determination step 210,
It consists of an input data acquisition step 211.

FIG. 3 is a flowchart showing the processing of the data saving device information acquisition means 2. This processing consists of a step 301 for acquiring data backup device input/output filter program name, a step 302 for acquiring data backup device name, a step 303 for acquiring data input/output size, and a step 304 for acquiring data backup device medium capacity.

FIG. 4 is a flowchart showing the processing of the filter activation means 3. This processing consists of a data exchange path establishment step 401, a child process generation step 402, and a data saving device input/output filter program execution step 403.

FIG. 5 is a flowchart showing the processing of the data output means 4. This process includes an output data existence determination step 501;
and an output data output step 502.

FIG. 6 is a flowchart showing the processing of the data input means 5. This process includes an input data existence determination step 601;
and an input data input step 602.

Figure 7 shows the data evacuation device input/output filter program 6.
This is a flow diagram showing the processing. This process includes a step 701 for securing a couch for data input/output, a step 702 for determining data processing type, a step 703 for determining the necessity of medium exchange, a step 704 for requesting medium exchange, a step 705 for output mode oven, and a step 706 for receiving output data.
, an output data end determination step 707 , a buffer cup determination step 708 , a data saving device writing step 709 , an internal output data existence determining step 710 , a data saving device writing step 711 ,
A medium exchange necessity determination step 712, a medium exchange request step 713, an input mode oven step 714,
Data saving device reading step 715, reading completion determination step 716, and input data passing step 71
7, step 718 for determining the end of all processing for the sofa, step 719 for notifying the end of reading, step 720 for closing the data saving device, and step 72 for ending the milt process.
Consists of 1.

Next, the operation of the data saving device input/output processing method of this embodiment configured as described above will be explained.

First, the processing of the data input/output control means 1 will be explained with reference to FIG.

The data input/output control means 1 performs the following processing.

First, information about the data saving device 7 necessary for inputting and outputting data to the data saving device 7 to be processed (the name of the data saving device input/output filter program 6 corresponding to the data saving device 7, the data saving device 7, the name of the data saving device input/output filter program 6, Information consisting of the device 70 name (logical name), the data input/output size of the data evacuation device 7, and the data evacuation device media capacity in the data evacuation bag W7 (hereinafter referred to as data evacuation device information) is obtained by acquiring data evacuation device information. Obtain by executing means 2 (step 201).

Next, it is determined whether the data processing to be performed is a process of outputting data to the data saving device 7 (output processing) or a process of inputting data from the data saving device 7 (input processing). (step 202).

In this determination, if the data processing to be performed is output processing, the output processing starting from step 203 is executed.

In the output process, first, the filter starting means 3 is executed to output the corresponding data evacuation device input/output filter program 6 (the data evacuation device input/output filter program 6 specified by the data evacuation device information acquired in step 201). mode (step 203).

Next, the data to be output to the data saving device 7 (output data) is sequentially acquired (step 204), and it is determined whether the output data exists (whether the output data was acquired in step 204). Step 205).

If output data exists in this judgment, the data output means 4 is executed to output the output data to the data evacuation device crowd filter program 6 (step 206), and step 204 is executed. return.

If it is determined in step 205 that no output data exists, the data saving device input/output filter program 6 is notified of the end of the output data (output end notification) (step 207), and the process ends.

If it is determined in step 202 that the data processing to be performed is input processing, input processing starting from step 208 is executed.

In the input process, first, by executing the filter starting means 3, the corresponding data saving device input/output filter program 6 is started in the input mode (step 208).

Next, data to be input (input data) is received from the data saving device input/output filter program 6 by executing the data input means 5 (step 209);
Determine whether or not input data exists (whether or not input data was received from the data evacuation device turnout filter program 6 in step 209) (step 21o)
.

If input data exists in this determination, the input data is acquired in step 211. ), the execution δ of step 209 returns.

If the input data does not exist as determined in step 210, the process ends.

Next, the processing of the data saving device information acquisition means 2 will be explained with reference to FIG.

The data backup device information acquisition means 2 performs the following processing.

First, the name of the data evacuation device input/output filter program 6 for controlling data input/output to the data evacuation bag W7 to be processed is acquired (step 301). In addition,
The data backup device input/output filter program 6 is a separate program from the data backup/restore program.
Input/output interface with the corresponding data saving device 7 (
This is a program that performs data input/output with the corresponding data saving device 7 while maintaining consistency in data input/output method type).

Next, the logical name of the data saving device 7 is acquired (step 302). Note that the logical name of the data saving device 7 is information used by the data saving device input/output filter program 6 to identify the data saving device 7.

Furthermore, the size of data in one input or output to the data saving device 7 (data input/output size)
(step 303).

Note that, according to this data input/output size, the data saving device input/output filter program 6 performs data input/output to the corresponding data saving device 7.

In addition, the data capacity that can be held by the input/output medium that is the data evacuation device medium in the data evacuation device 7 is acquired (data evacuation device medium capacity) (step 3).
04). In addition, according to this data backup device media capacity,
The data evacuation device input/output filter program 6 can determine the data input/output capacity for the corresponding data evacuation device 7 and request replacement of the data evacuation device medium.

Next, the processing of the filter activation means 3 will be explained with reference to FIG.

The filter activation means 3 performs the following processing.

First, a route for exchanging data with the corresponding data saver input/output filter program 6 is established (step 401). Here, in order to exchange data with the child process that executes the data backup device input/output filter program 6 generated in step 402, which will be described later,
Establishes a path for message exchange for data exchange (message exchange using pipeline control, message exchange using shared memory, etc.).

Next, the data evacuation device input/output filter program 6
Step 402: Create a child process to execute
), starts and executes the day's boar data backup device input/output filter program 6 on its child process (step 403
). When starting the data evacuation device input/output filter program 6, by giving the name, data input/output size, and data evacuation device media capacity of the corresponding data evacuation device 7 as arguments, the data evacuation device information is imported into the data evacuation device. It is transmitted to the output filter program 6.

Next, the processing of the data output means 4 will be explained with reference to FIG.

The data output means 4 performs the following processing.

Determine whether or not there is output data to the corresponding data evacuation device input/output filter program 6 (step 5
01).

If output data exists in this judgment, the output data is output to the data saving device input/output filter program 6 (Step 502), Step 501
Return to execution.

If it is determined in step 501 that there is no output data, the process ends.

Note that in the process of step 502 when the amount of output data passed by the data input/output control means 1 exceeds the amount that can be output in one process in the data saving device input/output filter program 6, the output data is While dividing, output data is output to the data saving device input/output filter program 6.

Next, the processing of the data input means 5 will be explained with reference to FIG.

The data input means 5 performs the following processing.

It is determined whether input data from the corresponding data saving device input/output filter program 6 exists (step 601).

If the input data exists in this judgment, the input data is input from the data saving device input/output filter program 6 (step 602), and the process returns to step 601.

If the input data does not exist as determined in step 601, the process ends.

Finally, the processing of the data saving device input/output filter program 6 will be explained with reference to FIG.

The data saving device input/output filter program 6 corresponding to the data saving bag N7 to be processed performs the following processing.

First, a buffer for data input/output is secured (step 701). As the size of this buffer, the data input/output size passed as an argument when starting the data saving device input/output filter program 6 is used.

Next, it is determined whether the data processing to be performed is output processing or input processing for the data saving device 7 (step 702), and if it is output processing, control is transferred to step 703; if it is input processing, control is transferred to step 703). Step 712
transfer control to

In the output process, first, it is determined whether or not it is necessary to replace the data backup device medium (medium exchange) (step 703).
).

If it is determined that medium exchange is necessary, a medium exchange request is made to the user (step 704), and after the medium exchange, the data saving device 7 is opened in output mode (step 705).

If the process of step 705 is completed or step 7
If the medium exchange is not necessary in the determination of 03, the output data passed from the data output means 4 is received (step 706).

Whether the output data could be received in step 706 (whether the output data to be received is not finished)
is determined (step 707).

If the output data is not finished in this determination, it is determined whether the buffer for output to the data saving device 7 is full (step 70B).

If the buffer is not full in this judgment, step 7
Return to execution of 06.

If the buffer is full as determined in step 708, the contents of the buffer are written to the data saving device 7 (
Step 709), returning to the execution of step 703.

If it is determined in step 707 that the output data is finished, it is determined whether or not output data that has not been output to the data saving device 7 remains in the buffer (step 710).

If the output data remains in the buffer in this judgment, the output data is written to the data saving device 7 (
Step 711), close the data saving device 7 Step 720), terminate the Shirako process (the data saving device input/output filter program 6) Step 7
21), the process ends.

If it is determined in step 710 that no output data remains in the buffer, close the data saving device 7 (step 720) and terminate the whitening process (step 7).
21) , the process ends.

In the input process, first, it is determined whether or not medium exchange is necessary (step 712).

If it is determined that medium exchange is necessary, a medium exchange request is made to the user (step 713), and after the medium exchange, the data saving device 7 is opened in input mode (step 714).

If the process of step 714 is completed or step 7
If it is determined in step 12 that medium exchange is not necessary, the input data is read from the data saving device 7 into the buffer (step 715).

Next, it is determined whether or not the input data could be read in step 715 (step 716).

If it is determined that the reading is not completed, the input data is passed to the data input means 5 (step 717), and it is determined whether all the input data for the buffer has been processed (step 718).

If it is determined that all input data for the buffer has been processed, the process returns to step 712.

If it is determined in step 718 that all the buffered input data has not been processed (unprocessed input data remains in the buffer), the process returns to step 717.

If the reading is completed as determined in step 716, a notification of the completion of reading the input data from the data saving device 7 (reading completion notification) is sent to the data input means 5 (step 719), and the data saving device 7 Step 720), the albino process is completed (Step 721), and the process ends.

〔Effect of the invention〕

As explained above, the present invention performs data input/output processing to a data evacuation device using a data evacuation device input/output filter program (a program different from the data evacuation/restoration program) corresponding to the data input/output method of the data evacuation device. ), it is possible to increase the independence between the data backup/restore program and the data backup device, and it is possible to change the data input/output method of the data backup device or support the data backup device with a new data input/output method. This has the effect that it is possible to deal with it by changing or creating a corresponding data evacuation device input/output filter program (this can be done without affecting the existing data evacuation/restoration program at all). be.

In addition, as an interface regarding the data evacuation device input/output processing method in the data evacuation/restore program,
Since it is only necessary to define one interface with the filter (data backup device input/output filter program group), the program logic of the data backup/restore program can be simplified, and the data backup/restore program itself can be There is also the side effect of being able to reduce the scale of

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing of the data input/output control means in FIG. 1, and FIG. 3 is data saving device information in FIG. 1. 4 is a flow chart showing the processing of the filter activation means in FIG. 1; FIG. 5 is a flow chart showing the processing of the data output means in FIG. 1; FIG. 6 is a flow chart showing the processing of the data output means in FIG. FIG. 7 is a flowchart showing the processing of the data input means in FIG. 1. FIG. 7 is a flowchart showing the processing of the data saving device input/output filter program in FIG. In the figure, 1... Data input/output control means, 2... Data saving device information acquisition means, 3... Filter activation means, 4... Data output means, 5... Data input means, 6. ...Data evacuation device input/output filter program, 7...Data evacuation device.

Claims (1)

[Scope of Claims] In a data evacuation device input/output processing method that performs data input/output processing to a data evacuation device used for saving/restoring database data, the method is independent of the data evacuation/restoration program and the data evacuation device. a data evacuation device input/output filter program that interposes between the two and writes output data to the corresponding data evacuation device and reads input data from the corresponding data evacuation device; and data that acquires data evacuation device information. Data evacuation/restoration that starts the corresponding data evacuation device input/output filter program using a data evacuation device information acquisition means in the evacuation/restoration program and the data evacuation device information obtained by the data evacuation device information acquisition means. a filter activation means within the program; a data output means within the data evacuation/restore program that passes output data to the data evacuation device to the data evacuation device input/output filter program corresponding to the data evacuation device; data input means in a data save/restore program that receives input data from the data save device input/output filter program corresponding to the data save device; and data save device information for performing data input/output processing to the data save device. A data saving device input/output processing method comprising: an acquisition means, a filter activation means, a data input/output control means in a data save/restore program that controls the data output means and the data input means.