JPH1173278A - Slave built-in time shortening method for duplex computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slave built-in method for duplex computer system capable of speeding up a slave built-in processing, and shortening the temporary stopping time of the processing of a master system computer inevitable for the slave built-in processing. SOLUTION: This method is provided with two disk devices 1 and 2 to which access can be performed from master system and slave system computers M0 and S0. The master system is connected through an inter-system communication path to the salve system. At the time of copying data on the memory of the master system to the slave system, the data are divided into plural data blocks, and the master system computer M0 alternately writes the divided data blocks in the two disk devices 1 and 2, and the slave system computer S0 alternately reads the data blocks written by the master system from the disk devices 1 and 2, and develops the data on the memory of its own device. When one disk device is the object of the wiring processing by the master system, the other disk is used as the object of the reading processing by the slave system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplicated computer system in which the same data is independently processed in parallel by two computers, and more particularly, in order to operate as a duplicated system, the processing data of a master computer is transmitted to a slave computer. The present invention relates to a slave embedding processing method which is a copy processing.

[0002]

2. Description of the Related Art In an independent parallel type dual computer system in which two host computers receive the same data from another system and process the data on their respective memories,
Regarding which one of the two host computers adopts the processing data of which computer, the system of the master system and the slave system are provided to operate the redundant system,
Even if a failure occurs in one of the master and slave computers, the remaining computer is switched to the master computer so that processing can be continued without affecting the operation of the system.

However, if a failure occurs in the remaining master computer, the system operation is completely stopped.

[0004] Therefore, when a single state (only one of the computers in the duplex configuration) is established, the failed host computer is started up again as a slave system, and the duplex operation is resumed. It is necessary to take measures to increase the reliability of the system.

At this time, it is necessary to copy the data of the master computer to the memory of the slave computer and then restart the processing. At this time, as one of the data copying methods, the master / slave computer is used. There is a data transfer method using an inter-communication path and a cross-call type disk device.

In the above method, after the master computer writes its own memory data to the disk device, a write completion notification is transmitted to the slave computer via the inter-system communication path. After a series of processes of expanding the data written by the computer on its own memory and transmitting a notification of completion of expansion to the master computer via the inter-system communication path, the operation is resumed as a redundant system.

In order to obtain complete synchronization of the data on the memories of the two host computers, it is necessary to temporarily stop updating the memory data of the master computer during the slave installation process. The suspension period,
Due to the nature of the redundant system, it must be within the time until a failure is recognized by another connected system (for example, communication timeout).

That is, this method is a method in which the master computer writes all the data in its own memory to the disk device and then reads it in the slave computer. , The installation time becomes longer by (writing time of the master computer) + (reading time of the slave computer).

[0009]

As described above, in the conventional method, when the slave incorporating process is performed, it is necessary to temporarily suspend the data update of the master computer. , (The writing time of the master computer to the disk device) + (the reading time of the slave computer from the disk device) becomes longer, and as a result, the fault tolerance (fault tolerance) of the redundant system becomes longer. ) Is reduced.

The reason is that, after the master computer writes all the data in the memory of its own device to the disk device, the reading process of the slave computer is started, and one computer performs the integration process by the other computer. This is because the processing is in a waiting state during the operation.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has as its object to speed up the slave incorporation process and reduce the time for temporarily suspending the processing of the master computer inevitable in the slave incorporation process. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and system for shortening a slave computer in a redundant computer system.

[0012]

In order to achieve the above object, a method of incorporating a slave in a duplex computer system according to the present invention is a duplex computer system in which the same data sent from a plurality of subsystems is simultaneously processed by two host computers. In a computer system, when starting redundant operation, synchronization of processing data, that is, copying of master processing data to a slave system is performed using two disk devices and an inter-system communication path. Features.

[0013] In addition, according to the present invention, there is provided a method for assembling a slave in a duplicated computer system, comprising: a duplicated computer system comprising a master computer and a slave computer, which is accessible from both the master computer and the slave computer. 1,
A second disk device, for performing a process of copying data in the memory of the master computer to a slave computer, dividing the data into a plurality of data blocks, and the master computer dividing the divided data blocks; Sequentially, alternately writing to the first disk device and the second disk device, the slave computer sequentially writes data blocks written by the master computer,
The data is alternately read from the first disk device and the second disk device and expanded on the memory of the slave computer. At this time, the first disk device and the second disk device
If one of the disk devices is a target of data write processing by the master computer, the other is alternately accessed as a target of data read processing by the slave computer.

[0014] The dual computer system of the present invention comprises:
First and second disk devices accessible from both a master computer and the slave computer are provided, and when performing a process of copying data in a memory of the master computer to the slave computer, a plurality of the data are copied. The master computer includes means for controlling the divided data blocks to be sequentially and alternately written to the first disk device and the second disk device.
The slave computer, for the data block written by the master computer,
Means for sequentially reading data from the first disk device and the second disk device alternately and developing the data on the memory of the slave computer, wherein one of the first disk device and the second disk device is When data is to be written by the master computer, the other computer alternately accesses the data to be read by the slave computer and copies data in the memory of the master computer to the slave computer.

[0015]

Embodiments of the present invention will be described below. In a preferred embodiment, a method for incorporating a slave in a redundant computer system according to the present invention includes first and second disk devices accessible from both a master computer and a slave computer. When copying data in the memory to the slave computer, the data is divided into a plurality of blocks, and the divided data blocks are
The writing is alternately and sequentially written to the first and second disk devices, and the slave computer is controlled so that the data blocks written by the master computer are alternately read from the first and second disk devices.

In the embodiment of the present invention, a master computer and a slave computer (M0 and S0 in FIG. 1) are provided with a dual control unit (M1 and S1 in FIG. 1).
It has a data transfer control unit (M2, S2 in FIG. 1) and an inter-system communication control unit (M3, S3 in FIG. 1). The control in each of these control units may be realized by program control executed by a CPU or the like.

In the embodiment of the present invention, first and second disk devices are provided, one of which is a target of data write processing by a master computer, and the other is a target of data read processing by a slave computer. By controlling the computers to be used alternately, the master system and the slave system computers can minimize the processing wait time of each other, and can shorten the time for assembling the slave.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

FIG. 1 is a block diagram showing the overall system configuration of an embodiment of the present invention. Referring to FIG. 1, in one embodiment of the present invention, a disk device 1 and a disk device 2 are accessible from each of a master computer M0 and a slave computer S0. Data is stored.

The inter-system communication path 3 connects the master computer M0 and the slave computer S0, and sends and receives data write completion notification from the master computer M0 and data expansion completion notification from the slave computer S0. .

The duplicate control unit M1 of the master computer M0 is provided with a data storage memory M by the other control unit M4.
5 to control the start and stop of updating, write control of the block division data to the data transfer control unit M2, and transmission control of the write completion notification to the inter-system communication path M3.

The data transfer control unit M2 of the master computer M0 writes the block data to the disk device 1 or the disk device 2 based on the block data write instruction from the duplication control unit M1, and notifies the completion of the write of the block data. Is returned to the duplex control unit M1.

The inter-system communication controller M3 of the master computer M0 sends the data write completion notification from the duplex controller M1 to the slave computer S through the inter-system communication path 3.
0, and notifies the duplication control unit M1 of the deployment completion notification received from the slave computer S0.

The duplex control unit S1 of the slave computer S0 controls the other control unit S4 to start updating the data storage memory S5, controls the data transfer control unit S2 to expand block-divided data, and controls the inter-system communication control unit S4.
3 is controlled to transmit a deployment completion notification.

The data transfer control unit S2 of the slave computer S0 reads the block data from the disk device 1 or the disk device 2 based on the block data expansion instruction instructed by the duplication control unit S1, and expands the data into the storage memory S5. , A block data development completion notification is returned to the duplex control unit S1.

The inter-system communication control unit S3 of the slave system computer S0 transmits the deployment completion notification from the duplexing control unit S1 to the master system computer M0 via the inter-system communication path 3, and receives the write completion notification received from the master system computer M0. The notification is sent to the duplex control unit S1.

FIG. 2 is a diagram for explaining a slave incorporation operation in one embodiment of the present invention. The operation of one embodiment of the present invention will be described with reference to FIGS.

When the slave incorporation process is executed, the master computer M0 temporarily stops updating the memory data (step S001), divides the memory data into predetermined size units, and divides the memory data into blocks. , The disk device 1 and the disk device 2 are written alternately.

In FIG. 2, the memory data is divided into n pieces of data 10 to 1n.
0 is stored in the disk device 1 (step S002),
1 is stored in the disk device 2 (step S004).
2 is stored in the disk device 1 (step S006),
n is written alternately in the disk device 2 (step S008).

The master computer M0 sends a write completion notice to the slave computer S0 immediately after writing the data (steps S003, S00).
5, S007, S009).

Regarding the write timing to the disk device in the master computer M0, the data 10
And the data 11 are continuously written to the disk device 1 and the disk device 2, respectively, but the blocks after the data 12 are after receiving the expansion completion notification from the slave computer S0 as described later. .

This is to realize exclusive control for avoiding data loss and erroneous recognition by accessing one disk device from both computers.

Upon receiving the write completion notification from the master computer M0, the slave computer S0 reads the master data from the disk device based on the disk device identification information and the data identification information included in the completion notification message, and sends the data to the memory S5. (Step S01)
1, S013, S015, S017).

After the completion of the expansion into the memory, the slave computer S0 transmits a data block expansion completion notification to the master computer M0 (step S01).
2, S014, S016, S018).

When the master computer M0 receives the expansion completion notification from the slave computer S0, the master computer M0 stores the data block in the slave computer S0.
Recognizing that the data has been copied to 0, the next data block is written to the disk device.

These operations are repeated, and a notice of completion of development of the last data block 1n is sent to the master computer M.
By receiving 0, the slave incorporating process is completed.

In general, the comparison of the data writing time to the disk device is such that (writing time)> (reading time). Therefore, the time required for transmitting and receiving the block data write completion notification and the expansion completion notification is taken into consideration. Also,
It is unlikely that the master computer M0 waits for the deployment completion notification from the slave computer S0. For this reason, when the slave incorporating process is performed according to the above process flow, the master computer M
While data blocks divided by "0" are alternately and continuously written to the disk drive 1 and the disk drive 2, data copy to the slave computer S0 can be completed. It is possible to reduce the time compared to the embedded processing method.

[0038]

As described above, according to the present invention,
This has the effect of shortening the slave incorporation time in a redundant computer system, thereby suppressing the increase in the slave incorporation time due to the increase in copy data. As a result, according to the present invention, the processing stop time of the master computer can be reduced particularly, which contributes to the improvement of the fault-tolerance of the redundant computer system.

The reason is that according to the present invention, the master computer divides the data to be copied to the slave computer into a plurality of data blocks, writes the divided data alternately on two disk devices, and completes the writing. This is because the control is performed so that the data obtained is immediately expanded into the memory of the slave computer, thereby minimizing the processing waiting time of the other computer during the integration processing.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation flow of a slave incorporating process according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 Disk device 3 Inter-system communication path M0 Master computer M1 Duplex control unit of master computer M2 Data transfer control unit of master computer M3 Inter-system communication control unit of master computer M4 Other control unit of master computer M5 Data storage memory of master computer S0 Slave computer S1 Redundant controller of slave computer S2 Data transfer controller of slave computer S3 Inter-system communication controller of slave computer S4 Other controller of slave computer S5 Slave computer Data storage memory

Claims (10)

[Claims] 1. A duplicate computer system in which the same data sent from a plurality of subsystems is simultaneously processed by two host computers.
That is, the processing of copying the master processing data to the slave system (this processing is called “slave embedding processing”).
Is performed using two disk devices and an inter-system communication path,
A method for assembling a slave in a redundant computer system. 2. A redundant computer system comprising a master computer and a slave computer, comprising: first and second storage devices accessible from both the master computer and the slave computer; When performing a process of copying data in the memory of the system computer to the slave computer, the data is divided into a plurality of data blocks, and the master computer sequentially divides the divided data blocks into the first storage. Writing alternately to the device and the second storage device, the slave computer, for the data block written by the master computer,
The data is sequentially read from the first storage device and the second storage device alternately and expanded on the memory of the slave computer. At this time, one of the first storage device and the second storage device is A method of assembling a slave in a duplex computer system, wherein, when data is to be written by the master computer, the other computer is alternately accessed as data to be read by the slave computer. 3. The master computer writes the divided data block into one storage device, writes the next data block continuously into another storage device, and then writes the next data block again into the one storage device. In performing the process of writing to the storage device, the slave computer reads the data block previously written by the master computer to the one storage device, and after receiving the completion notification of the development of the data block to the memory, 3. The method according to claim 2, further comprising the step of writing data to one of the storage devices. 4. A duplicated computer system comprising a master computer and a slave computer, comprising: first and second storage devices accessible from both the master computer and the slave computer; When performing a process of copying data on a memory of a system computer to the slave computer, the data is divided into a plurality of data blocks, and the master computer sequentially divides the divided data blocks into the first storage device. And means for controlling the data to be written alternately to the second storage device.
Means for sequentially reading data from the first storage device and the second storage device alternately and developing the read data in the memory of the slave computer, wherein one of the first storage device and the second storage device is When data is to be written by the master computer, the other is alternately accessed as data to be read by the slave computer, so that data on the memory of the master computer is copied to the slave computer. A redundant computer system. 5. An inter-system communication path is provided between the master computer and the slave computer, and when the master computer completes writing data blocks to the storage device, the slave computer completes writing. A notification, and a notification of completion of expansion to the master system computer when expansion of the data block read from the storage device to the memory by the slave system computer is completed is performed through the inter-system communication path. 4. The redundant computer system according to 4. 6. The storage system specified by the storage device identification information based on the storage device identification information and data identification information included in the write completion notification from the master system computer. 5. The dual computer system according to claim 4, wherein the data block is read and expanded in a memory. 7. The dual computer system according to claim 4, wherein said storage device comprises a disk device. 8. The master system computer writes the divided data block to one storage device, writes the next data block continuously to another storage device, and then writes the data block again to the one storage device. In performing the process of writing to the storage device, the slave computer reads the data block previously written by the master computer to the one storage device, and after receiving the completion notification of the development of the data block to the memory, 3. The method according to claim 2, further comprising the step of writing data to one of the storage devices. 9. The method according to claim 2, wherein said storage device is a disk device. 10. When the master computer performs a process of copying data in a memory of the master computer to a slave computer, data blocks obtained by dividing the data in the memory into a plurality of data are sequentially read. Means for controlling so as to alternately write data into a first storage device and a second storage device accessible from both the master computer and the slave computer; (b) in the slave computer, The written data blocks are sequentially and alternately read from the first storage device and the second storage device and developed on the memory of the slave computer. At this time, the first storage device and the second One of the storage devices is the master system Means for controlling the other storage device to be alternately accessed as an object for data read processing by the slave computer when the data is to be written by the computer; A recording medium on which a program for realizing the above-mentioned function by the master computer and the slave computer is recorded.