JPH07114504A - Data broadcasting transfer system - Google Patents

Abstract

PURPOSE:To improve transfer efficiency by minimizing the resource consumption at a transfer source and to speedily cope with a fault by making an operator correctly grasp the transfer state when one computer broadcasts and transfers the same program and data to other computers. CONSTITUTION:This system is equipped with a transfer destination connecting and disconnecting means 2 which generates a transfer management table 5 in a main storage on the basis of a transfer management file 8 containing transfer information, saves the transfer management table 5 periodically in the transfer management file 8 by a transfer management table generating and saving means 1, and makes connections with and disconnections from respective transfer destinations on the basis of transfer destination addresses and transfer state codes in the transfer management table 5. Further, this system is equipped with a communication response information receiving means 3 which receives response information regarding the connections with and data transfer to the transfer destinations and updates the transfer states in the transfer management table 5 and a transfer means 4 which reads in transfer data through a data file reading buffer 6, obtains transferrable destination addresses from the transfer management table 5, and transfers data through a buffer 7 for transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transmission for broadcasting files to maintain programs and data commonly used on a plurality of computers constituting a node in a medium / large scale network system. Regarding information transfer method.

[0002]

2. Description of the Related Art Conventionally, when a program or data used by a distributed processor or a terminal in one network system (hereinafter, a program and data to be transferred is simply referred to as data) is updated, the transfer is performed. The transfer source files were secured for the number of destinations, and the same number of file transfer tools were executed individually.

Further, when the computer resources of the transfer source are not sufficient, the transfer is performed for each transfer destination, or the medium is carried to carry out the registration work at the distribution destination.

[0004]

However, in the case of a broadcast file transfer in which the same program or data is to be simultaneously distributed to a plurality of destinations, in the conventional file transfer system, a disk area is set for each destination on the transfer source computer. It is necessary to secure a large amount of disk area even for jobs that require a job, and are not always executed. Also, a file transfer program (not necessarily a job, not a job as a CPU allocation unit) is created for each destination. Process or task) must be operated, main memory is required for the number of simultaneous transfers, and the load on the transfer source computer system is increased like the disk area.

When the file transfer program is operated for each destination, even if the data is the same, the read operation from the disk occurs as many times as the number of destinations, and the I / O channel and the CPU are used accordingly. There is also a problem that the load on the computer system is increased and the influence on the operation is very large.

In the operation of the file transfer program, the operator will deal with the operator's console of the transfer source computer in case of unpreparation of the destination computer or a network failure. It was difficult to get a proper and prompt understanding of.

During the operation of the file transfer program, when the transfer is interrupted due to a failure of the destination computer, a network failure, an abnormal termination of the file transfer program, a system failure of the transfer source computer, or the operation is interrupted due to system operation, At the time of restart, it is necessary to retransmit from the beginning of the data, and there is a disadvantage that waste of computer resources occurs.

[0008]

[Means for solving the problems] A transfer management table is created in the main memory based on the transfer management file in which transfer information is stored, and the transfer management table is periodically stored in the transfer management file in preparation for a transfer interruption. Transfer management table generation and saving means for saving,
Transfer destination connection / disconnection means for connecting to and disconnecting from each transfer destination computer based on the transfer destination address and transfer status code in the transfer management table, and receiving response information for connection to the transfer destination and data transfer, The communication response information receiving means for updating the transfer status of the transfer management table and the transfer data are read via the data file reading buffer, the transferable transfer destination address is obtained from the transfer management table, and the data is transferred via the transfer buffer. And a transfer means for transferring.

[0009]

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

FIG. 1 is a block diagram showing the configuration of the present invention. A transfer management table 5 is created in the main memory on the basis of a transfer management file 8 in which transfer information is stored to prepare for a transfer interruption. Transfer management table generation save means 1 for saving the transfer management table 5 in the transfer management file 8 periodically, and the transfer management table 5
Transfer destination connection disconnecting means 2 for connecting to and disconnecting from each transfer destination computer based on the transfer destination address and transfer status code in the transfer destination, and connection information to the transfer destination and the response information for data transfer, and the transfer management table 5, the transfer data is read through the communication response information receiving means 3 for updating the transfer status of 5 and the buffer 6 for reading the data file, the transferable transfer destination address is obtained from the transfer management table 5, and the transfer buffer 7
And a transfer means 4 for transferring data via the.

Here, the transfer management table 5 is generated in the main memory of the computer after the system is started, and the transfer management table generating and saving means 1, the transfer destination connection disconnecting means 2, the communication response information receiving means 3 and the transfer means 4 are formed. Shall be referred to and updated at the same time.

N in the transfer management table 5 in FIG. 1 represents the number of transfer destinations, and a serial number from 1 to N is assigned to each transfer destination. The transfer destination address is used to specify the transfer destination when connecting / disconnecting with the transfer destination and performing data transfer, and to identify the transfer destination for the response from the transfer destination and the failure notification on the communication line. It

The transfer management file 8 has the same data items as the transfer management table 5, and is prepared before the system is activated. When performing a new transfer, the transfer status record and the transfer completion block number are all 0 (zero), and the transfer destination serial number and the transfer destination address are set by the operator of this system. When operating from the transfer source computer,
In addition, when it is started after being interrupted due to a system failure or the like, the data content of the transfer management table 5 saved before the interruption is used as it is. In either case, the contents of the transfer management file 8 are created as the transfer management table 5 by the transfer management table creation / save means 1.

The data file 9 is data or a program commonly transferred to each transfer destination, is prepared by the operator before the transfer is started, and stores only one set of data or program. The blocks in the data file 9 are read by the input / output instructions in the transfer means 4 and stored in the data file reading buffer 6.

The data file reading buffer 6 is
After the system is started up, it is secured in the main memory and is referred to and updated by the transfer means 4. The transfer unit 4 refers to the data file reading buffer 6 when the block to be transferred is not in the transfer buffer 7. If it is not in the transfer file reading buffer 6 either, it is read from the data file 9 and stored in the transfer file reading buffer 6. At this time, if there is no free area in the data file reading buffer 6, it is replaced with a block having a block number less than or equal to the minimum transfer completion block number in the transfer management table 5. LRU if there is no corresponding block
(Least Recently Used) Replaces with the block selected by logic.

The transfer buffer 7 is secured in the main memory after the system is activated, and is referenced and updated by the transfer means 4. When there is no block to be transferred in the transfer buffer 7, the transfer means 4 transfers the data file reading buffer 6 to the transfer buffer 7. At this time, if there is no free area in the transfer buffer 7, block replacement is performed by the same logic as in the case of the data file reading buffer 6.

The transfer status code of FIG. 2 will be described below.

Transfer status code 1: Transfer destination connection disconnecting means 2
Waiting for connection completion notification after the connection command is issued by.

Transfer status code 2: A state in which the block is already connected to the transfer destination and is waiting for the block transfer of the transfer completion block number + 1.

Transfer status code 3: a state of waiting for a transfer completion notification after the transfer instruction is issued by the transfer means 4.

Transfer status code 4: a state in which all blocks have been transferred and waiting for disconnection processing.

Transfer status code 5: A status of waiting for disconnection completion notification during disconnection processing after completion of transfer of all blocks.

Transfer status code 6: A status in which transfer of all blocks is completed and disconnection is completed.

Transfer status code 7: Indicates that the communication response information receiving means 3 has received an error that has occurred on the communication line or on the transfer destination computer, and is waiting for disconnection processing as preprocessing for continuing transfer. .

Transfer status code 8: A status of waiting for a disconnection completion notification during disconnection processing at abnormal time.

Transfer status code 9: A status in which disconnection processing at the time of abnormality has been completed and the transfer destination connection disconnecting means 2 is waiting for a reconnection command to be issued.

First, the general operation of the present invention will be described with reference to FIG.

When an operator requests a broadcast file transfer, the transfer management table generating and saving means 1 is activated (step 3-1), the record is read from the transfer management file 8 and the transfer management table 5 is generated ( Step 3-2). Next, the transfer management table generating and saving means 1 sequentially activates the communication response information receiving means 3, the transfer destination connection disconnecting means 2, and the transfer means 4 (steps 3-3, 3-4, 3-5).

After that, in preparation for interruption due to a system failure or the like, the transfer management table 5 is transferred to the transfer management file 8 at regular time intervals.
(Steps 3-6 and 3-7), and at the same time, it is determined whether or not the transfer to all the transfer destinations is completed, based on whether the transfer status code in the transfer management table 5 is 6 (step 3-).
8).

When it is judged that the transfer to all the transfer destinations is completed, the transfer means 4, the transfer destination connection disconnecting means 2 and the communication response information receiving means 3 are stopped in order (steps 3-9, 3-).
10, 3-11), transfer management table 5 to transfer management file 8
After the evacuation to, the transfer management table generation evacuation means 1 is also stopped (step 3-12).

The transfer management table generating / saving means 1 can be interrupted by the operator. In this case, the transfer management table generating means 1 saves the generated transfer management table 5 in the transfer management file 8. Stop.

The operation of the transfer destination connection disconnecting means 2 will be described in detail with reference to FIG.

When the transfer destination connection disconnection means 2 is activated by the transfer management table generation save means 1, the transfer destination connection disconnection means 2 refers to the transfer status codes in the order of the transfer destination serial numbers in the transfer management table 5 to connect or disconnect the communication line. Judgment is performed.

Transfer status code is 0 (waiting for connection) or 9
In the case of (disconnection when abnormal) (step 4-2), a connection command is issued to the transfer destination (step 4-).
3), change the transfer status code to 1 (step 4-
4).

The transfer status code is 1 (a connection command was issued, but a connection completion notification could not be received within a fixed time),
4 (All block transfer completed, waiting for disconnection) 5
(All blocks have been transferred and a disconnection command has been issued, but a connection completion notification could not be received within a fixed time), 7 (an error was received in the communication line and the transfer destination computer, and waiting for disconnection processing), 8 (I issued a disconnection command when something went wrong,
In either case (the disconnection completion notification could not be received within the fixed time) (step 4-5), a disconnection command is issued to the transfer destination (step 4-6) and the transfer status codes are set to 8 and 5, respectively. Change the setting to 5, 8, 8 (Step 4-
7). The above processing is repeated for all the transfer destinations in order (steps 4-8 and 4-9), and once the processing for all the transfer destinations has been completed, stop for a certain period of time (step 4-9) and perform the same processing. (Steps 4-1 to 4-
Up to 10.)

The operation of the communication response information receiving means 3 will be described in detail with reference to FIG.

The communication response information receiving means 3 is activated by the transfer management table generating and saving means 1, becomes ready to receive the communication response information from the communication line, and then is stopped until the communication response information is received. When the communication response information is received (step 5-1), the communication response information is judged.

The communication response information is a connection completion notification (step 5).
-2), or block transfer completion notification (step 5-
In the case of 3), the transfer status code in the transfer management table 5 is changed to 2 (step 5-4). In the case of an abnormality notification (step 5-5), the transfer status code is changed to 7 (step 5-6).

The communication response information receiving means 3 is also terminated by a stop command from the transfer management table generating / saving means 1 or an interrupt by the operator.

The operation of the transfer means 4 will be described in detail with reference to FIGS. 6 and 7.

The transfer means 4 activated by the transfer management table generation save means 1 has a transfer status code of 2 in the transfer management table 5.
Whether or not there is a transfer destination is checked (step 6-2).

If there is no transfer destination, a certain time interval is set,
The transfer management table 5 is referred to again, and the presence / absence of a transfer destination having a transfer status code of 2 is repeatedly checked.

If there is a transfer destination, the minimum value of the transfer completion block number is obtained for the transfer destination having the transfer status code of 2 (step 6-3). It is determined whether the minimum value is 1 or more and is equal to the number of blocks (step 6-4).

Here, the number of blocks means the data file 9
It represents the number of data blocks inside, and the initial value zero (0) is set immediately after the transfer means 4 is started, and the block number immediately before is set as the number of blocks when the file end record of the data file 9 is detected. If the minimum value of the transfer completion block number is 1 or more and is equal to the number of blocks, it is determined that the transfer of all blocks is completed, and the transfer status code is changed to 4 (step 6-5). If the minimum value is not 0 or is not equal to the number of blocks, it is judged that data transfer is required, and it is checked whether or not there is a block having the minimum transfer completion block number + 1 block number in the transfer buffer 7 (step 6). -6).

If there is a block having the block number of the minimum value of the transfer completion block number + 1, the transfer command is issued as it is (the process shifts to step 7-11 and thereafter). If not, the data file reading buffer 6 is checked (step 6-7). When the block having the block number of the minimum value of the transfer completion block number + 1 plus the block number is in the data file reading buffer 6, the block is transferred to the transfer buffer 7 and a transfer command is issued (processes from step 7-6 onward). Move).

When transferring to the transfer buffer 7, the transfer buffer 7 is checked (step 7-6), and if there is a free area, the corresponding block is selected (step 7-8). If there is no free area, Checks whether there is a block having a number less than or equal to the minimum transfer completed block number of the transfer management table 5 (step 7-7), and if there is, selects the corresponding block (step 7-8). If not, the block selected by the LRU logic is selected (step 7-9).
Next, the block selected in step 7-8 or step 7-9 is transferred to the corresponding block in the transfer buffer 7 (step 7-10).

If there is no block having the block number of the minimum value of the transfer completion block number + 1, in the data file reading buffer 6, the corresponding block is read from the data file 9 (step 6-8). When the end-of-file record is detected when reading the data file 9 (step 6-9), the minimum value is set as the number of blocks (step 6-10), and the transfer status code 2 in the transfer management table 5 is transferred again. The process returns to the process of obtaining the minimum value of the transfer completion block.

When the corresponding block is read from the data file 9 (step 6-8), if there is no free area in the data file reading buffer 6, the block is replaced with the same logic as the transfer buffer 7 (step 7-). 1 to steps 7-5).

After that, the data is transferred to the transfer buffer 7 (steps 7-6 to 7-10), a transfer command is issued, and the data is transferred to the corresponding transfer destination (step 7-11).

After the transfer command is issued, the transfer code of the transfer destination is changed to 3 (block transfer in progress) (step 7-1).
2) Repeat the transfer from the transfer buffer 7 and the process of changing the transfer status code to 3 while there is another transfer destination having the minimum value in the transfer completion block number (step 7-1).
1 to steps 7-13). If there is no corresponding forwarding destination,
Again, the process returns to the process of obtaining the minimum value of the transfer completion block number for the transfer destination whose transfer status code is 2.

Incidentally, in the case of the transfer means 4 as well, the stop command of the transfer management table generation / save means 1 or an operator interrupts and ends.

Hereinafter, a specific operation example representing the characteristics of the embodiment of the present invention will be described with reference to FIG.

According to the transfer management table 5 shown in FIG. 8, there is a transfer destination whose transfer status code is 2. Therefore, the minimum value of the transfer completed block number is 7 among them. The number of blocks is 10
Therefore, it is necessary to transfer the block of block number 8, but since block number 8 is not in the transfer buffer 7,
Block number 8 of data file reading buffer 6
Block is transferred to the transfer buffer 7. At this time, since there is no free space in the transfer buffer 7, the block number 8 is set in the area of the block number 10 which is used less frequently by the LRU logic.
Stores the block of.

Next, the transfer instruction of the block number 8 is issued to the transfer destination address A, and the transfer status code 3 is changed. Further, the same process is performed on the transfer destination address D having the same transfer completion block number 7, and then the process returns to the process of finding the transfer destination having the transfer status code of 2 again.

In this embodiment, even if the number of transfer destinations increases, the number of data files is one, and the number of each means is also one.
Hardly increases. The data read time can also be minimized by using two types of buffers, the load on the transfer source computer can be minimized, and the broadcast data transfer can be performed efficiently. Furthermore, priority is given to the transfer destination having the smaller transfer completion block number to improve the broadcast property, and the system resources can be efficiently used.

Further, when the processing is interrupted due to a system failure or the like, the processing can be continued based on the transfer management table saved immediately before. If transfer to some transfer destinations is not completed due to a line failure, etc., the operator intervenes once,
The process is interrupted so that the process can be continued with a simple operation after the failure recovery. At this time, the operator
By referring to the transfer management file, it is possible to grasp the transfer status even during the transfer and perform the failure recovery processing.

Therefore, it is possible to speed up troubleshooting and at the same time minimize waste of system resources.

[0058]

As described above, the same program or data is transferred from one computer to a plurality of other computers on a medium or large scale network system in which a plurality of computers are connected by communication lines. By using the data broadcast transfer method of the present invention,
Minimize the computer resource usage of the transfer source,
This has the effect of increasing transfer efficiency.

Even when a failure occurs, the latest transfer management file data can be used to minimize the waste of system resources due to retransmission, and the operator can accurately grasp the transfer status and quickly respond to the failure. Become.

[Brief description of drawings]

FIG. 1 is a schematic diagram according to a block configuration diagram of the present invention.

FIG. 2 is a code list of transfer status codes in a transfer management table.

FIG. 3 is a flowchart of a process of a transfer management table generating and saving unit.

FIG. 4 is a flowchart of a process of a transfer destination connection disconnecting unit.

FIG. 5 is a flowchart of a process of a communication response information receiving unit.

FIG. 6 is a flowchart of processing of a transfer unit.

FIG. 7 is a flowchart of processing of a transfer unit.

FIG. 8 is a schematic diagram for explaining an operation example of FIGS. 6 and 7.

[Explanation of symbols]

 1 Transfer management table generating and saving means 2 Transfer destination connection disconnecting means 3 Communication response information receiving means 4 Transfer means 5 Transfer management table 6 Data file reading buffer 7 Transfer buffer 8 Transfer management file 9 Data file 10, 11, 12 Communication line

Claims (2)

[Claims] 1. In a computer system in which a plurality of computers are connected by a communication line, a transfer management table is created in the main memory based on a transfer management file in which transfer information is stored to prepare for a transfer interruption. Transfer management table generating and saving means for periodically saving the transfer management table to a transfer management file, and connection and disconnection to each transfer destination computer based on the transfer destination address and transfer status code in the transfer management table Transfer destination connection / disconnection means, which receives the response information for the connection to the transfer destination and the data transfer, and the communication response information receiving means for updating the transfer status of the transfer management table, and the transfer data via the data file reading buffer. And a transfer means for obtaining a transferable transfer destination address from the transfer management table and transferring the data through the transfer buffer. Data broadcast transmission method that. 2. The contents of the transfer management table are composed of a transfer destination serial number, a transfer destination address, a transfer status code, and a transfer completion block number. 2. The data broadcasting transfer method according to claim 1, wherein the transfer management table is periodically saved in a transfer management file.