JPH0736627A - Magnetic disk device access controller - Google Patents

Abstract

PURPOSE:To shorten the access time of frequently accessed data with respect to the magnetic disk device access controller which controls input/output of data of a magnetic disk device. CONSTITUTION:The storage area of a magnetic disk device 200 is divided into a specific area 210 where specific data is written and a general area 220 where general data is written, and a magnetic disk device access controller 100 is provided with a specific data storage means 110 where data in the specific area 210 is inputted/outputted, and the specific data storage means 110 is accessed when a processor 100 accesses data in the specific area 210 of the magnetic disk device 200, and the general area 220 of the magnetic disk 200 is accessed when it accesses the general area 220 other than the specific area 210.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device access control device for controlling data input / output of a magnetic disk device.

A storage device used in a computer system is
Generally, it is roughly classified into a main storage device that requires high speed and an external storage device that requires large capacity and low bit unit price. The external storage device includes a magnetic tape device, a magnetic disk device, an optical disk device, etc., and an optimum device for the system is selected and used from the storage capacity, the bit unit price, and the like.

The magnetic disk device is a storage device which is widely used in computer systems because it has a large capacity and a low unit price per bit and can transfer arbitrary information at high speed.

Since the magnetic disk device is a known technique, it will be briefly described. FIG. 4 is a diagram for explaining the magnetic disk device. (A) shows the structure of the magnetic disk D. The disk D is an aluminum alloy disk coated with a magnetic material, and data is input and output along the circumference. Such concentric storage areas are called tracks,
The track is further divided into a plurality of storage areas, which are called sectors. In this example, the tracks are 1 to n and the sectors are 1 to m.

FIG. 1B shows a magnetic disk device including magnetic disks D1 to D4, magnetic heads H1 to H4, and a motor M. The magnetic disks D1 to D4 are connected to the motor M and rotate. On the other hand, the magnetic heads H1 to H4 move on the magnetic disks D1 to D4 from the periphery to the center to read designated data. The average time for the magnetic head Hi to move to the specified track at this time is called the seek time, and the time until the data in the specified sector of the magnetic disk Di is read is called the rotation waiting time.

Usually, the surface of the uppermost magnetic disk D1 and the lowermost magnetic disk D4 (here, D4 is shown, but the number of magnetic disks is not limited to four, and a magnetic disk device is used. No data is input to or output from the back surface of the magnetic heads H1 and H4 corresponding to the magnetic disks D1 and D4, which is a type that accesses only one side of the magnetic disk. And a magnetic head H corresponding to the magnetic disks D2 and D3
2 and H3 are of a type in which the front surface and the back surface can be accessed.

[0007]

2. Description of the Related Art FIG. 5 shows a block diagram for explaining a conventional example. In the figure, 100 is a magnetic disk device access control device, 200 is a magnetic disk device, 300 is a processing device, 4
00 is a common bus.

The processing device 300 is a magnetic disk device 200.
When inputting / outputting data to / from the magnetic disk device, the magnetic disk device access control device 100 is instructed to access the data of the specified sector of the specified track of the magnetic disk device 200 through the common bus 400.

[0009]

When the processing device 300 accesses the magnetic disk device 200, the rotation waiting time / seek time determined by the structure of the magnetic disk device 200 is required, and the throughput for inputting / outputting data is poor. .

According to the present invention, when the processing device accesses the magnetic disk device, frequently accessed data is written in the storage means of the magnetic disk device access control device, and frequently accessed by accessing this storage means. The present invention aims to realize a magnetic disk drive access control device capable of shortening the access time of data to be stored.

[0011]

FIG. 1 is a block diagram for explaining the principle of the present invention. In the figure, 100 is a magnetic disk device access control device, 200 is a magnetic disk device, 3
00 is a processing device, and 400 is a common bus.

Reference numeral 210 denotes a specific area in the magnetic disk device 200 in which specific data is written, and 220
Is a general area in which general data is written. further,
110 is provided in the magnetic disk device access control device 100 according to the present invention, and is a specific data storage means for inputting / outputting data in the specific area 210.

With such a configuration, the magnetic disk device 20
The data in the specific area 210 of 0 is written in the specific data storage means 110 of the magnetic disk device access control device 200, and the processing device 300 accesses this data.

[0014]

[Operation] Data that is frequently accessed is specified as data
It is assumed that the data is written in the specific area 210 of the magnetic disk device 200. The data in the specific area 210 is written in the specific data storage means 110 of the magnetic disk device access control device 200. (In FIG. 1) In this state, the processing device 300 causes the magnetic disk device 20 to
When accessing the specific area 210 of 0, the specific data storage means 110 is accessed (in FIG. 1), and the specific area 2
When the general area 220 other than 10 is accessed, the magnetic disk device 200 is directly accessed (in FIG. 1).

With this structure, frequently accessed data is accessed from the specific data storage means 110, so that the data input / output throughput can be increased.

[0016]

FIG. 2 is a block diagram illustrating an embodiment of the present invention. The figure shows an embodiment in which the principle of FIG. 1 is applied to an electronic exchange. In the figure, 100 is a magnetic disk device access control device, and 110A is a ram (hereinafter referred to as RAM) as the specific data storage means 110 described in the principle diagram. And 1
Reference numeral 20 is a detection unit for detecting power-on, 200 is a magnetic disk device, 210A is a charging data area as the specific area 210 described in the principle diagram, 220 is a general area, 300A is a central control unit, 400 is a common bus, and 500 is A magnetic tape device, 600 is a console.

Other components of the electronic exchange include a network and various trunks, but the drawing shows only the portion related to the magnetic disk drive access control device 100 of the present invention.

In the electronic exchange, the central control unit 300A performs exchange processing and various services in accordance with the exchange processing program. Here, the billing processing will be described as an example. The exchange processing program is written on the magnetic tape in the magnetic tape device 500, and the exchange processing program is transferred from the magnetic tape in the magnetic tape device 500 to the electronic exchange in accordance with the instruction of the initial setting IPL from the console 600. The data is written in a main storage device (not shown) and in the general area 220 of the magnetic disk device 200. On the other hand, billing data for performing detailed billing by call-by-call is written in billing data area 210A.

Here, the detecting unit 120 detects that the IPL state is in the initial setting, that is, the power is turned on, and the charging data area 210A of the magnetic disk device 200 is detected.
The charging data written in the above is instructed to be written in the RAM 110A of the magnetic disk device access control device 100.

In this state, the electronic exchange is operated by the central control unit 3
Under the control of 00A, arbitrary telephones are connected to each other, and when the call is finished, the charging process for the call is performed. The billing process is performed as a product of the unit price per hour and the talk time determined by the distance to the called party. The central controller 300A identifies the area of the other party from the telephone number, and the billing data for that area from the RAM 110A. The call charge is calculated by reading out and multiplying by the call time.

The charging data area 210A as described above is accessed from the central control unit 300A every time a call is completed, and is frequently accessed. By performing such frequent access to the RAM 110A instead of the magnetic disk device 200, it becomes possible to perform the charging process at high speed, and the central control device 300A.
It is possible to reduce the load related to the billing process and improve the exchange process efficiency as an electronic exchange.

When accessing data in the general area 220 other than the charging data, the magnetic disk device 200
Direct access to. In this embodiment, the detection unit 120 detects that the power is turned on and the charging data area 2 is stored in the RAM 110A.
Although the charge data of 10A is written, it is also possible to write the data to the RAM 110A by setting a special command and inputting this special command.

FIG. 3 is a block diagram illustrating another embodiment of the present invention. In FIG. 3, the periodic writing control unit 130 is used instead of the detection unit 120 in the configuration of FIG.

The billing process in the electronic exchange described with reference to FIG. 2 is important for the operator of the electronic exchange and the user of the telephone, and the billing data which is the basis of the billing process is always kept accurate and up to date. Required to be present. Therefore, in the other embodiment of FIG. 3, the periodic write control unit 130 is provided, and the RAM 110A is periodically provided.
By writing the billing data of the above into the billing data area 210A, the data is always stored as the latest data and correctly.

The periodic write control unit 130 is configured to be activated by a timer (not shown) to perform periodic write. However, a special command is set by software and the special command is input to write the data in the RAM 110A. It is also possible to do

Although the embodiment of FIG. 2 and the other embodiments of FIG. 3 have been described by taking the electronic exchange as an example, the present invention is not limited to the electronic exchange, and the magnetic disk device used in the computer system is frequently accessed. It is needless to say that the throughput of the data to be read can be increased by using a similar magnetic disk drive access control device.

[0027]

According to the present invention, the data in the frequently accessed area in the magnetic disk device is written in the RAM in the magnetic disk device access control device, and when the data in this area is accessed, the magnetic disk is used. By accessing the RAM of the device access control device, it is possible to increase the data processing speed.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram illustrating an embodiment of the present invention.

FIG. 3 is a block diagram illustrating another embodiment of the present invention.

FIG. 4 is a diagram illustrating a magnetic disk device.

FIG. 5 is a block diagram illustrating a conventional example.

[Explanation of symbols]

 100 magnetic disk device access control device 110 specific data storage means 110A RAM 120 detection unit 130 periodic write control unit 200 magnetic disk device 210 specific area 210A billing data area 220 general area 300 processing device 300A central control device 400 common bus 500 magnetic tape device 600 console D, D1 to D4 magnetic disk H1 to H4 magnetic head M motor

Claims (3)

[Claims] 1. A magnetic disk device access control device (100) for controlling input / output of data from / to a magnetic disk device (200), wherein specific data is written in a storage area of the magnetic disk device (200). It is divided into a specific area (210) and a general area (220) in which general data is written, and the magnetic disk device access control device (100) inputs and outputs the data of the specific area (210) to the specific data storage. Means (110) are provided, and the processing device (300) is the magnetic disk device (20).
0) when accessing the specific area (210),
When accessing the specific data storage means (110) and accessing the general area (220) other than the specific area (210), the general area (220) of the magnetic disk device (200) should be directly accessed. An access control device for a magnetic disk device. 2. The magnetic disk device access control device (100) according to the preceding claim, further comprising a detection unit (120) for detecting power-on, and when the detection unit (120) detects that the power is turned on, 2. The magnetic disk device according to claim 1, wherein the data in the specific area (210) of the magnetic disk device (200) is written in the specific data storage means (110) of the magnetic disk device access control device (100). Access control device. 3. The magnetic disk device access control device (100) according to claim 1, wherein the specific area (21) of the magnetic disk device (200).
0) is provided with a periodic write control unit (130) for periodically writing data, and the periodic write control unit (130) causes the specific data storage means (110) of the magnetic disk device access control device (100). ) Data to a magnetic disk device (2
2. The magnetic disk drive access control device according to claim 1, wherein the write operation is periodically performed in the specific area (210) of (00).