JPH08106363A - Multi-disk device - Google Patents

Abstract

PURPOSE: To eliminate an unnecessary process regarding the right to use a bus which is generated on a disk device by altering and writing the contents of a transfer unit register at the time same on the basis of the contents of a connection number register and a transfer speed register. CONSTITUTION: When a computer 1 writes file data to a disk device 1, a data division processing part 6 alters the transfer unit register 5 on the basis of the contents of a register 9 for the number of connected disks which stores the number of connected disk devices, the contents of an in-disk-device transfer speed register 8 which stores the data transfer speed between a disk part 13 and a cache 12, and the contents of a bus transfer speed register 5 which stores the speed of data transfer performed between the cache 12 and a transfer control part 4 through the bus 10 so that requests to use the bus do not conflict with each other. The transfer control part 4 determines the data transfer quantities of disk devices 11A to 11D according to the contents of the transfer unit register 5 and writes data obtained by arbitrarily dividing the file data in the respective disk devices 11A to 11D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk system for controlling a plurality of disk devices to read / write data, and more particularly to a multi-disk device having an excellent processing procedure for acquiring a bus use right.

[0002]

2. Description of the Related Art In recent disk systems, in order to realize high speed and large capacity, a multi-disk system in which one disk control device simultaneously controls a plurality of disk devices has become mainstream. In such a disk system, since a plurality of disk devices are connected to one bus, a competition process for acquiring the bus use right occurs.

In general, this contention processing sets a priority unique to each disk device, and when a plurality of disk devices request the bus use right at the same time, the disk device with the higher priority acquires the bus use right. ing.

However, in such a competition processing system, when the bus usage rate increases, so-called sinking may occur in which processing of a disk device having a low priority is kept waiting. In order to prevent such sinking, as described in Japanese Patent Laid-Open No. 64-12325,
A means for counting the number of times that the bus use right cannot be acquired is provided in the disk control device, and when the counting state of the counting means reaches a predetermined number, the processing of the disk device relating to the number of times counting is preferentially performed. I was doing.

[0005]

By using the conventional technique, the processing for the disk devices in the disk system is averaged, but the bus usage right requests generated by the respective disk devices are not reduced. In this disk device, useless processing occurs in which the own disk device cannot acquire the bus use right.

Further, as shown in FIG. 2, in a disk system in which a plurality of disk devices are connected, one file data is divided into a certain unit and written in each disk device. Therefore, when a plurality of disks are booted at the same time to read the file data, each disk device reads the same amount of data and requests the bus use right, so that the conflict process shown in FIG. 3 occurs. There is a problem that it becomes easy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-disk device capable of eliminating wasteful processing which occurs in each disk device and cannot be acquired by its own disk device.

[0008]

In order to achieve the above object, in the present invention, a transfer unit holding means for holding a transfer unit, which is under the control of a computer, and computer data for storing data of the computer Disk control including storage means and transfer control means for transferring data between the contents of the computer data storage means and any disk device connected to the bus according to the contents of the transfer unit holding means An apparatus, a disk unit that stores data, a disk unit that includes data to be written to the disk unit, and a temporary storage unit that stores data read from the disk unit, and a bus that connects a plurality of the disk devices The number of the disk devices connected to the disk control device via the bus in the disk system Connected unit holding means, a disk unit internal transfer speed holding unit for holding the data transfer speeds of the disk unit and the temporary storage unit in the disk device, and between the temporary storage unit and the transfer control via a bus. Bus transfer rate holding means for holding the data transfer rate of
A data dividing means for arbitrarily changing the contents of the transfer unit holding means based on the contents of the connected number holding means, the disk device transfer speed holding means, and the bus transfer speed holding means is provided.

[0009]

The number-of-connections holding means holds the number of disk devices connected to the bus written from the disk control device, and the transfer speed holding means in the disk device holds between the disk unit written from the disk control device and the temporary storage means. Holds the data transfer rate, the bus transfer rate holding means holds the data transfer rate between the temporary storage means and the transfer control means written from the disk controller, and the data dividing means holds the information from the connected number holding means and the disk. Based on the information from the in-apparatus transfer rate holding means and the information from the bus transfer rate holding means, the data dividing means is used to arbitrarily change the contents of the transfer unit holding means. Since the transfer control means operates so as to determine the amount of data to be transferred to the disk device based on the contents of the transfer unit holding means, the data dividing means is operated and the contents of the transfer unit holding means are arbitrarily changed while each disk is being operated. When data is written to the device, file data is arbitrarily divided and written to each disk device.

When this file data is read, since the amount of data read from each disk device differs, the timing of the bus usage right acquisition request is deviated. There is an effect that it is possible to eliminate useless processing in which the usage right cannot be acquired.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 is a diagram showing a first embodiment of the present invention, FIG. 4 is an explanatory diagram of a write operation of the embodiment, FIG. 5 is an explanatory diagram of a data division method, and FIG. 6 is an explanatory diagram of a read operation of the embodiment. is there.

In FIG. 1, reference numeral 11 denotes a disk device including a disk unit 13 for storing data and a cache 12 for temporarily storing the data of the disk unit 13, and 1 is a computer for controlling the entire disk system. 2 is a disk controller that arbitrarily divides the data from the computer 1 and writes the data to the disk device 11 via the bus 10 or assembles the data read from the disk device 11 and transfers it to the computer 1. 3 is a computer 1 is a transfer data storage area for storing data from the disk device 11 and 4 is a disk device for transferring data in the transfer data storage area 3 via the bus 10 based on the contents of the transfer unit register 5 for storing transfer units. 11 or write the data of the disk device 11 to the contents of the transfer unit register 5 via the bus 10. A transfer control unit for reading the transfer data in the transfer data storage area 3, 6 for the contents of the connected number register 9 for storing the number of connected devices, and 6 for the contents of the disk device internal transfer speed register 8 for storing the data transfer speed between the disk unit 13 and the cache 12. And the bus 1 between the cache 12 and the transfer control unit 4.
This is a data division processing unit that changes the transfer unit register based on the contents of the bus transfer speed register 7 that stores the data transfer speed performed via 0.

In FIG. 4, 20 is file data written from the computer 1 to the transfer data storage area 3, and 30A is a transfer unit register 5 updated by the data division processing unit.
The division unit data 5 cut out from the file data 20 and written in the disk device 11A based on the contents of the above, and the transfer unit register 5 updated by the data division processing unit 30B
The division unit data 5 cut out from the file data 20 and written in the disk device 11B based on the contents of the above, and the transfer unit register 5 updated by the data division processing unit 30C.
The division unit data 5 cut out from the file data 20 and written in the disk device 11C based on the contents of the above, and 30D is the transfer unit register 5 updated by the data division processing unit.
It is divided data that is cut out from the file data 20 based on the contents of and is written in the disk device 11D.

When writing file data from the computer 1 to the disk device 11, the data is divided using the data dividing method shown in FIG.
Write the divided data to. When file data is written from the computer 1 to the transfer data storage area 3 and a write command is issued from the computer 1 to the disk controller 2, the disk controller 2 controls the data division processing unit 6 and the transfer controller 4. Start writing data.

First, the data division processing unit 6 reads the contents of the connected number register 9 and sets n = 4 (Processing 4).
0). Next, the number counter is initialized (m = 1) (process 41). Next, an initial value is put into the transfer unit register 5 (process 42). Next, the transfer control unit 4 reads the divided data 30A corresponding to the contents of the transfer unit register from the file data 20 stored in the transfer data storage area 3, and writes the data to the disk device 11n via the bus 10 (Process 4).
3). After the writing is completed, the disk control device 2 checks the remaining file data 20 stored in the transfer storage area 3, and if all the file data 20 have been transferred, the writing process is ended (process 44). If there is transfer data left,
The number counter is checked, and if m <n is not established, the process returns to the process 41 (process 45). When m <n is established, the number counter is incremented (Process 4
6). Next, the contents of the transfer unit register are updated by the calculation formula shown in process 47, and the process returns to process 43. In the present embodiment, four disk devices 11 are connected to the disk control device 2, so that the divided data 30B is thereafter transferred to the disk device 11.
In B, the divided data 30C is written in the disk device 11C, and the divided data 30D is written in the disk device 11D, and the writing process ends.

In this embodiment, the process 43, the process 44,
Although the process 45, the process 46, and the process 47 were repeated four times and ended and the process did not return to the process 41, this is not the case when the data amount of the file data 20 is large. Processing 4
The calculation formula 7 is that the other disk device 11
Another disk device 1 that is read immediately before the own disk device 11 so that the bus usage right request and the bus usage right request do not collide.
1 calculates the amount of data that can be read from the disk unit 13 to the cache 12 until the processing is completed.

When a read command is issued from the computer 1 to the disk controller 2, the disk controller 2 issues a read command to the disk devices 11A to 11D. Each disk device 11 transfers data from the disk unit 13 in which the data is stored to the cache 12, and makes a bus usage right request for acquiring the usage right of the bus 10 after the transfer is completed.

In this embodiment, each disk device 11
Since the divided data 30 is written by changing the data transfer unit, the read end timing differs.
As shown in FIG. 6, each disk device 11 issues a bus usage right request in order from the disk device 11 with the smallest data transfer unit to read, and the disk device 11A issues a bus usage right request to start the competition process. Since the other disk devices 11B to 11D do not issue the bus use right request, the disk device 11A acquires the bus 10.

The transfer control unit 4 reads the data from the disk device 11A which has acquired the bus use right into the transfer data storage area 3. Next, the disk device 11B issues a bus use right request to start the conflict process, but another disk device 11A
Since the disk devices 11C to 11D do not issue the bus use right request, the disk device 11B acquires the bus 10.
The transfer control unit 4 uses the disk device 11 that has acquired the bus use right.
The data from B is read into the transfer data storage area 3. Next, the disk device 11C issues a bus usage right request to start the conflict process, but the other disk devices 11D and the disk devices 11A to 11B do not issue the bus usage right request, so the disk device 11C acquires the bus 10. . Transfer control unit 4
Reads the data from the disk device 11C that has acquired the bus use right into the transfer data storage area 3. Finally, the disk device 11D issues a bus use right request and the competition process starts. However, since the other disk devices 11A to 11C do not issue the bus use right request, the disk device 11D acquires the bus 10. The transfer control unit 4 reads the data from the disk device 11D that has acquired the bus use right into the transfer data storage area 3.

In the present embodiment, the connection number register 9 that holds the number of disk devices connected to the disk control device 2 via the bus 10, the data of the disk unit 13 and the cache 12 in the disk device 11 are stored. In-disk device transfer rate register 8 for holding transfer rate, and bus 1
Transfer based on the contents of the bus transfer speed register 7 that holds the data transfer speed between the cache 12 and the transfer control unit 4 via 0, the connection number register 9, the disk device transfer speed register 8 and the bus transfer speed register 7 A feature is that a data division processing unit for changing the contents of the unit register by the division method shown in FIG. 5 is provided.

[0021]

According to the present invention, when the file data 20 is written to the disk devices 11A to 11D, the contents of the connected number register 9, the disk device internal transfer speed register 8 and the bus transfer speed register 7 are changed as shown in FIG. Originally, the data division processing unit 6 writes while changing the contents of the transfer unit register 5. After this, the disk devices 11A-1
When the divided data 30A to 30D are read from 1D, the amount of data read from each disk device 11 is different, so the timing of the bus usage right acquisition request is shifted, and the bus usage right generated in each disk device 11 cannot be acquired. It is possible to eliminate unnecessary processing.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment.

FIG. 2 is a block diagram showing a conventional technique.

FIG. 3 is an explanatory diagram of problems of the conventional technology.

FIG. 4 is an explanatory diagram of a write operation of the first embodiment.

FIG. 5 is an explanatory diagram of a data division method.

FIG. 6 is an explanatory diagram of a read operation according to the first embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Computer, 2 ... Disk control device, 3 ... Transfer data storage area, 4 ... Transfer control part, 5 ... Transfer unit register, 6 ...
Data division processing unit, 7 ... Bus transfer speed register, 8 ... Transfer speed register in disk device, 9 ... Connected number register, 11 ... Disk device, 12 ... Cache, 13 ... Disk unit.

Claims (1)

[Claims] 1. A transfer unit holding means for holding a transfer unit under the control of a computer, a computer data storing means for storing data, and contents of the computer data storing means according to contents of the transfer unit holding means. And a disk controller configured to include transfer control means for transferring data between an arbitrary disk device connected to the bus, a disk unit storing data, and data to be written in the disk unit. In a disk system including a disk device including a temporary storage unit for storing data read from the disk unit and a bus connecting a plurality of the disk devices, the disk system is connected to the disk control device via the bus. Connected unit number holding means for holding the number of the above-mentioned disk devices, the above-mentioned disk unit in the above-mentioned disk device and the above-mentioned one In-disk transfer rate holding means for holding the data transfer rate of the storage means, bus transfer rate holding means for holding the data transfer rate between the temporary storage means and the transfer control via a bus, and the connected number holding means And a data dividing unit for arbitrarily changing the contents of the transfer unit holding unit based on the contents of the transfer rate holding unit in the disk unit and the bus transfer rate holding unit.