JPH1185660A - Data transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the occupation time of a bus with write to a magnetic disk device. SOLUTION: Data from a main storage device 2 are written through a bus 9 and a bus transceiver 6 into a dual port memory 5. At such a time point, the bus 9 is released. Next, the data written in the dual port memory 5 are read out and these data are written in a magnetic disk device 3. Since time for writing data into the dual port memory 5 is shorter than time for writing data into the magnetic disk device 3, the occupation time of the bus 9 is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a data transfer system, and more particularly to a data transfer system to a magnetic disk drive.

[0002]

2. Description of the Related Art Generally, in an information processing apparatus including an input / output device such as a CPU, a main storage device, a magnetic disk device, etc.
The CPU bus is occupied for a long time when an input / output request is made to an input / output device such as a magnetic disk device because the speed is significantly lower than the speed of the bus of the main storage device.

In the information processing apparatus, direct memory access is well known as a method for reducing the load on the CPU.

FIG. 7 is a configuration diagram of a data transfer system using direct memory access. The CPU 1, the main storage device 2, and the magnetic disk device 3 are connected by a data input / output bus 9, and a DMA (Direct Memory Access) controller 4 is connected between the bus 9 and the magnetic disk device 3.

When there is a data transfer request between the main storage device 2 and the magnetic disk device 3, the CPU 1 instructs the DMA controller 4 to transmit data to the destination device (in this case, the magnetic disk device 3) and to perform an input / output operation (Whether writing or reading is performed), the address of the source or destination main memory 2 of the transfer data and the number of transfer bytes are set.

The DMA controller 4 performs an input / output operation on the magnetic disk device 3 in accordance with the above-mentioned setting, and notifies the CPU 1 of the end of the operation by an interrupt after the operation.

[0007] After setting the parameters in the DMA controller 4, the CPU 1 is released from the input / output processing to the magnetic disk device 3 until receiving the end notification, and can execute other processing.

As described above, by direct memory access, C by input / output processing to the magnetic disk device
The load on the PU is reduced.

On the other hand, although different from this DMA, a cache memory is connected between the host computer and the disk array device, thereby reducing the waiting time due to access to the disk area and increasing the speed of parallel processing. An apparatus is disclosed in JP-A-7-244564.

[0010]

However, according to the prior art, the data input / output bus 9 is occupied by the DMA and the magnetic disk device 3 for a relatively long time required for the input / output operation to the magnetic disk device 3. As a result, there is a disadvantage that the performance of the entire information processing apparatus is reduced. The same applies to the technique disclosed in Japanese Patent Application Laid-Open No. 7-244564.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transfer system capable of shortening a bus occupation time required for writing to a magnetic disk device, thereby improving the processing capability of an information processing device. .

[0012]

In order to solve the above-mentioned problems, the present invention provides a first embodiment which is connected via a data input / output bus.
And a data transfer system between the second terminal,
The data from the first terminal is stored between the data input / output bus and the second terminal, and the stored data is stored in the second terminal.
It includes storage means for sending to the terminal, wherein the data writing speed to the storage means is faster than the data writing speed to the second terminal.

According to the present invention, after data is written in the storage means, data is transmitted and received between the storage means and the second terminal, so that the data input / output bus is released in a short time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram of a first embodiment of a data transfer system according to the present invention. The same components as those in the conventional example (FIG. 7) are denoted by the same reference numerals, and description thereof will be omitted.

The data transfer system includes a CPU 1, a main storage device 2, a magnetic disk device 3, a magnetic disk device 3,
A dual port memory 5 for holding data to be written to the magnetic disk device 3, a dedicated CPU for writing the data held in the dual port memory 5 to the magnetic disk device 3, a type of operation to the magnetic disk device ( Bus transceiver 7 which is connected / disconnected by writing or reading), bus transceiver control unit 8 which controls the connection / disconnection of bus transceiver 6 and bus transceiver 7 depending on the type of operation on the magnetic disk drive, data An input / output bus 9 is provided.

Next, the magnetic operation will be described. When a write request to the magnetic disk device 3 is made, the bus transceiver control unit 8 puts the bus transceiver 6 into a connected state and puts the bus transceiver 7 into a disconnected state. As a result, the dual port memory 5 is connected to the data input / output bus 9.

The CPU 1 executes data transfer from the main storage device 2 to the dual port memory 5, and executes other processing when the work is completed. That is, when the work is completed, the data input / output bus 9 is released. The CPU 4 transfers the data held in the dual port memory 5 to the magnetic disk device 3.

The time required for writing to the dual port memory 5 is faster than the time required for writing to the magnetic disk device. Therefore, by writing to the dual port memory 5 instead of writing to the magnetic disk device 3, the CPU performs the writing process to the magnetic disk device 3
1 and the time occupied by the data input / output bus 9 can be reduced.

On the other hand, when there is a read request from the magnetic disk device 3, the bus transceiver control section 8 puts the bus transceiver 6 into a disconnected state and the bus transceiver 7 into a connected state. As a result, the magnetic disk device 3 is directly connected to the data input / output bus 9. After that, CP
U1 executes data transfer from the magnetic disk device 3 to the main storage device 2.

That is, since the data from the magnetic disk device 3 is transferred to the main storage device 2 without passing through the dual port memory 5, reading from the magnetic disk device 3 can be maintained at the conventional speed. . That is, time can be saved by the time required for processing in the dual port memory 5.

Next, a detailed operation of the first embodiment will be described. FIG. 2 and FIG. 3 are schematic explanatory diagrams showing the detailed operation of the first embodiment.

When executing a write request to the magnetic disk device 3, the CPU 1 sends a read request and a read address to the main storage device 2 and sends a write request to the bus transceiver controller 8.

Upon receiving the write request, the bus transceiver control unit 8 sets the bus transceiver 6 to the connected state and the bus transceiver 7 to the disconnected state as shown in FIG. Main storage device 2 that has received the read request reads the data at the read address and transmits the data to dual port memory 5.

The CPU 1 repeats the data transfer process from the main storage device 2 to the dual port memory 5 according to the size of the data to be written to the magnetic disk device. Perform other processing using. That is, the data input / output bus 9 is released when the processing is completed. The time required for the write processing to the dual port memory 5 is faster than the time required for the write processing to the magnetic disk device.

Therefore, by writing to the dual port memory 5 instead of writing to the magnetic disk device 3, the time for which the CPU 1 and the bus 9 are occupied by the writing process to the magnetic disk device 3 can be reduced.

The magnetic disk write-only CPU 4 writes the data written in the dual port memory 5 to the magnetic disk device. Other processing executed by the CPU 1 and the CPU 4
Are written in parallel to the magnetic disk device.

On the other hand, when executing a read request from the magnetic disk device 3, the CPU 1 sends a write request and a write address to the main storage device 2 and sends a read request to the bus transceiver controller 8.

Upon receiving the read request, the bus transceiver control unit 8 sets the bus transceiver 6 in a disconnected state and the bus transceiver 7 in a connected state, as shown in FIG.

The magnetic disk device 3 reads data from the magnetic disk 3 according to the contents of the read request. The read data is transmitted to the main storage device 2 via the bus transceiver 7 without passing through the dual port memory 5 and the bus transceiver 6.

By using the bus 9 via the bus transceiver 7 at the time of reading, it is possible to maintain the conventional speed without performing the processing for the dual port 5 in the reading process.

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 4 is a configuration diagram of a data transfer system according to a second embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The second embodiment differs from the first embodiment in that D
It is a combination of MA controller.

This data transfer system includes a CPU 1, a main storage device 2, a magnetic disk device 3, and a magnetic disk device 3.
Dual-port memory 5 for holding data to be written to the magnetic disk device 3 dedicated to writing the data held in the dual-port memory 5 to the magnetic disk device 3, a type of operation for the magnetic disk device 3 The bus transceiver 6 and the bus transceiver 7 which are connected / disconnected by writing (reading only) and the bus transceiver for controlling the connection / disconnection of the bus transceiver 6 and the bus transceiver 7 depending on the type of operation on the magnetic disk device. Control unit 8, DMA (direct memory access) controller 10, data input / output bus 9
Is provided.

Next, the operation will be described. When a write request to the magnetic disk device 3 is made, the bus transceiver control unit 8 puts the bus transceiver 6 into a connected state and puts the bus transceiver 7 into a disconnected state. Thus, the dual port memory 5 is connected to the DMA controller 10.

The DMA controller 10 executes data transfer from the main storage device 2 to the dual port memory 5.
The CPU 4 transfers the data held in the dual port memory 5 to the magnetic disk device 3.

The time required for writing to the dual port memory 5 is faster than the time required for writing to the magnetic disk device. Therefore, by writing to the dual port memory 5 instead of writing to the magnetic disk device 3, the time for which the data input / output bus 9 is occupied by the write processing to the magnetic disk device 3 can be reduced.

On the other hand, when there is a read request from the magnetic disk device 3, the bus transceiver control unit 8 puts the bus transceiver 6 into a disconnected state and the bus transceiver 7 into a connected state. As a result, the magnetic disk device 3 is connected to the DMA controller 10. Then DM
The A controller 10 executes data transfer from the magnetic disk device 3 to the main storage device 2.

As described above, by using the DMA controller 10, the load on the CPU 1 due to the input / output processing to / from the magnetic disk device 3 is reduced.

Next, a detailed operation of the second embodiment will be described. FIG. 5 and FIG. 6 are schematic explanatory views showing detailed operations of the second embodiment.

When a write request to the magnetic disk device 3 is executed, the CPU 1 sends a type of input / output operation to be performed (in this case,
Write), the address of the source or destination main storage device 2 of the transfer data and the number of transfer bytes are set.

The DMA controller 10 refers to the type of input / output operation to be performed among the set parameters, and transmits the value to the bus transceiver control unit 8. If the type of the input / output operation transmitted is write, the bus transceiver control unit 8 puts the bus transceiver 6 into a connected state and puts the bus transceiver 7 into a disconnected state.

After confirming the control of the bus transceivers 6 and 7, the DMA controller 10 reads data from the main storage device 2 in accordance with the set parameters (address of the main storage device of the transfer data source and the number of transfer bytes). And stores the read data in the dual port memory 5.
To be stored.

The DMA controller 10 executes a data transfer process between the main storage device 2 and the dual port memory 5 in accordance with the set number of transfer bytes.
Notify U1.

The CPU 1 executes other processing until receiving the end notification from the DMA controller 10, and upon receiving the end notification, returns the processing to the program which has requested the write processing to the magnetic disk.

On the other hand, when executing a read request from the magnetic disk device 3, as shown in FIG. 6, the CPU 1 instructs the DMA controller 10 on the type of input / output operation to be performed (in this case, read) and the source of the transfer data. Alternatively, the address and the number of transfer bytes of the destination main storage device 2 are set.

The DMA controller 10 refers to the type of the input / output operation to be performed among the set parameters, and transmits the value to the bus transceiver control unit 8. If the type of the input / output operation transmitted is “read”, the bus transceiver control unit 8 puts the bus transceiver 6 into a disconnected state and puts the bus transceiver 7 into a connected state.

After confirming the control of the bus transceivers 6 and 7, the DMA controller 10 transfers the data from the magnetic disk device 3 according to the set parameters (address of the destination main storage device of the transfer data and number of transfer bytes). The read is executed, and the read data is transferred to the main storage device 2.

At this time, the data read from the magnetic disk device 3 is transmitted to the main storage device 2 via the bus transceiver 7 without using the dual port memory 5 or the bus transceiver 6. As described above, by using the bus 9 at the time of the read operation, it is possible to maintain the conventional speed without performing the process for the dual port memory 5 in the read process.

The DMA controller 10 controls the main storage device 2 and the magnetic disk device 3 according to the set number of transfer bytes.
And performs data transfer processing between them. CPU when finished
Notify 1.

[0050]

According to the present invention, there is provided storage means for storing data from the first terminal between the data input / output bus and the second terminal, transmitting the stored data to the second terminal, and storing the data. Since the data writing speed to the means is set to be faster than the data writing speed to the second terminal, the occupation time of the data input / output bus in the transmission processing to the second terminal can be shortened. Processing capacity can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of a data transfer system according to the present invention.

FIG. 2 is a schematic explanatory view showing a detailed operation of the first embodiment.

FIG. 3 is a schematic explanatory view showing a detailed operation of the first embodiment.

FIG. 4 is a configuration diagram of a data transfer system according to a second embodiment of the present invention.

FIG. 5 is a schematic explanatory view showing a detailed operation of the second embodiment.

FIG. 6 is a schematic explanatory view showing a detailed operation of the second embodiment.

FIG. 7 is a configuration diagram of a data transfer system using direct memory access.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 Main storage device 3 Magnetic disk device 4 CPU for magnetic disk writing 5 Dual port memory 6, 7 Bus transceiver 8 Bus transceiver control part 9 Data input / output bus 10 DMA controller

Claims (6)

[Claims] 1. A data transfer system between first and second terminals connected via a data input / output bus, wherein data from the first terminal is transmitted between the data input / output bus and the second terminal. And storing the stored data in the second
A data transfer system comprising a storage unit for sending to a terminal, wherein a data write speed to the storage unit is faster than a data write speed to the second terminal. 2. The data transfer system according to claim 1, further comprising sending means for sending data from said second terminal to said data input / output bus without passing through said storage means. 3. The data input / output bus further includes connection control means for controlling connection / disconnection between the data input / output bus and the storage means, wherein the connection control means transmits data from the second terminal to the data input / output bus. 3. The data transfer system according to claim 2, wherein said data input / output bus is disconnected from said storage means when said data input / output bus is disconnected. 4. The first terminal is a memory, and the second terminal is a memory.
The terminal is a disk device.
3. The data transfer system according to any one of 3. 5. The data transfer system according to claim 4, further comprising access means for accessing said first terminal between said second terminal and said data input / output bus. 6. The data transfer system according to claim 1, wherein said storage means is a dual port memory.