JPH0689144A - Magnetic disk processor - Google Patents

Abstract

PURPOSE:To provide a means for accessing other disks during the gap of the disk by a magnetic disk processor and to improve access performance. CONSTITUTION:This processor is provided with a director part 31 for controlling the entire magnetic disk processor 30 and directing an interface with a central processing unit 10, a data processing part 34 for performing data transfer control between the disks 41 and 42 and a main memory unit 20, an instruction processing part 33 for supplying operation instructions to the disks, an interface connection control part 36 for controlling the connection of a disk interface and a memory part 35 for storing the instructions decoded by the director 31. The data transfer control is processed at the data processing part 34 and operation instruction control is processed at the instruction processing part 33 respectively and independently and also, the interface of both the processing parts 34 and 33 and magnetic disk devices 41 and 42 is dynamically switch- controlled at the interface connection control part 36. Thus, the instructions such as seeking can be supplied to the other disk during the gap and the access performance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk processing device, and more particularly to a technique for improving access performance.

[0002]

2. Description of the Related Art A conventional magnetic disk processing apparatus will be described with reference to the drawings.

FIG. 2 is a block diagram of an information processing apparatus using a conventional magnetic disk processing apparatus.

An information processing apparatus using a conventional magnetic disk processing apparatus is a central processing unit 10 as shown in FIG.
And a main storage device 20, a magnetic disk processing device 30,
It is composed of magnetic disk devices 41 and 42.

The central processing unit 10 and the main storage unit 20 are connected only to the director unit 31 inside the magnetic disk processing unit 30, and the disk control unit 32 operates the magnetic disk units 41 and 42 in accordance with the command from the director unit 31. Sends commands and also magnetic disk devices 41, 42
The data transfer between the main storage device 20 and the main storage device 20 is controlled via the director unit 31.

[0006]

In the above-mentioned conventional magnetic disk processing apparatus, the disk control section 32 and the director section 31 during the data transfer need to concentrate on the data transfer processing. For example, the magnetic disk apparatus 41 and the main memory. There is a problem that other magnetic disk devices 42 cannot be serviced while data transfer is being performed between the devices 20.

However, in actuality, writing / reading of data in the magnetic disk device is performed by dividing it into a certain number of units of data, and the data transfer is suspended in the section (gap) of the division.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk processing apparatus which can effectively utilize the data transfer pause period in the gap to solve the above drawbacks and improve the disk access performance.

[0009]

A magnetic disk processing apparatus according to the present invention is located between a magnetic disk apparatus and a central processing apparatus and a main storage apparatus, and in accordance with a command from the central processing apparatus,
In a magnetic disk processing device that controls data transfer between a main storage device and a magnetic disk device, receives a command from a central processing unit, decodes whether the command is a data transfer command or a control command, and based on the decoding result, the magnetic disk The director unit that controls the entire processing unit, the memory unit that records the command decoding result by the command from the director unit, the command decoding result is read from the memory unit by the command from the director unit, and the main command is based on the read command decoding result. A data processing unit that controls data transfer between the storage device and the magnetic disk device, and outputs whether the data transfer is being executed or is in a pause;
An instruction processing unit that reads out a command decoding result from the memory unit according to a command from the director unit, and sends an operation command to the magnetic disk device based on the command decoding result when the data processing unit is in a data transfer pause, When the data processing unit is executing data transfer, the magnetic disk device and the data processing unit are physically connected, and when the data transfer is suspended, the magnetic disk device and the instruction processing unit are physically connected. It has an interface connection control unit for switching according to an output during execution / pause of data transfer from the processing unit.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an information processing apparatus using a magnetic disk processing apparatus according to an embodiment of the present invention.

In FIG. 1, the magnetic disk processing device 30 of this embodiment has a central processing device 10 and a main storage device 20 connected to the upper part thereof, and a magnetic disk device 41 to the lower part thereof.
42 are connected in a daisy chain form.

The central processing unit 10 is a magnetic disk unit 41.
Alternatively, when it becomes necessary to perform an input / output operation with any one of the same 42, the magnetic disk processing device 30 is connected via the control line 101.
The command is transmitted to the director section 31 inside the.

Here, for example, the command is the magnetic disk device 4
It is assumed that the data read command is for 1. After writing the target disk device number of the command and the read command to the memory unit 35 via the control line 315, the director unit 31
The data processing unit 34 is instructed to start executing the command via the control line 314. The data processing unit 34 uses the control line 354.
The command target disk number and the command are fetched from the memory unit 35 via the
Then, the execution of the read command is started via the data line 341, the interface connection control unit 36, and the control / data line 300. Further, during this period, the data processing unit 34 determines that the data transfer is suspended during the gap.
It outputs to the command processing unit 33 and the interface connection control unit 36 via 46.

Next, it is assumed that the central processing unit 10 needs to execute a seek command to the magnetic disk device 42 in parallel with the data transfer.

At this time, the central processing unit 10 transmits this to the director section 31 in the same procedure as above. Director section 3
1 transmits this to the instruction processing unit 33 in the same procedure as above. The command processing unit 33 takes out a command (seek command to the magnetic disk device 42) to be executed in the same procedure as above,
When the control line 346 is monitored and it is detected that the data transmission is stopped, the operation command (seek command) is sent to the magnetic disk device 42. The interface connection control unit 36 interfaces with the magnetic disk devices 41 and 42 according to the state of the control line 346 as described above (for physically connecting the control / data line 300 to either the data line 341 or the control line 331). Control.

[0017]

As described above, the magnetic disk processing apparatus of the present invention is provided with means for independently processing the data transfer control and the operation command control, and operates the interface between both processing units and the magnetic disk apparatus. By providing the means for controlling the switching dynamically, it becomes possible to utilize the data transfer pause period due to the gap during the data transfer which could not be effectively used in the past, and thereby the access performance to the disk, that is, the information processing apparatus. There is an effect that the input / output performance of can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an information processing device using a magnetic disk processing device according to an embodiment of the present invention.

FIG. 2 is a block diagram of an information processing apparatus using a conventional magnetic disk processing apparatus.

[Explanation of symbols]

10 central processing unit 20 main memory unit 30 magnetic disk processing unit 31 director unit 32 disk control unit 33 command processing unit 34 data processing unit 35 memory unit 36 interface connection control unit 41, 42 magnetic disk device 101, 313, 314, 331 346, 353, 3
54 control line 201,341 data line 300 data / control line

Claims (1)

[Claims] 1. A magnetic disk process which is located between a central processing unit and a main storage unit and a magnetic disk unit, and which controls data transfer between the main storage unit and the magnetic disk unit according to a command from the central processing unit. An apparatus receives a command from the central processing unit, decodes whether the command is a data transfer command or a control command, and controls the entire magnetic disk processing device based on the decoding result; and a director unit, Memory unit for recording the command decoding result according to the command, and reading the command decoding result from the memory unit according to the command from the director unit, and based on the read command decoding result, the main storage unit and the magnetic disk unit. A data processing unit that controls the data transfer between the two, and outputs whether the data transfer is being executed or is being suspended. , The command decoding result is read from the memory unit in response to a command from the director unit, and when the data processing unit is in a data transfer pause, an operation command is issued to the magnetic disk device based on the command decoding result. A command processing unit for sending out, and when the data processing unit is executing data transfer, physically connects the magnetic disk device and the data processing unit,
When data transfer is suspended, an interface connection control unit for switching the magnetic disk device and the instruction processing unit according to a data transfer execution / pause output from the data processing unit so as to physically connect the magnetic disk unit and the instruction processing unit. A magnetic disk processing device characterized by having.