JPH04113413A - Computer system - Google Patents

Abstract

PURPOSE:To easily select the capacity of a hard disk device in accordance with each user by providing a disk controller which secures the logical connection between one of plural disk devices and a CPU when an access request is received from the CPU. CONSTITUTION:A disk controller 5A is connected to a CPU 9 via a system data bus 8 and also can be dynamically switched among the hard disk devices 11-14. When an access request is received from the CPU 9, the controller 5A secures the logical connection between one of those devices 11-14 and the CPU 9. Therefore the overflowed data are written into a connected idle hard disk device even if the capacity of a certain hard disk device is filled with data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a computer system in which a hard disk device, which is a peripheral device of a computer, and a computer are connected by a data bus.

[Conventional technology] The configuration of a conventional example will be explained with reference to FIG.

FIG. 2 is a block diagram, not showing a conventional computer system.

In Figure 2, (1) and (2) are hard disk devices, (3) and (4) are cables, (5) are hard disk controllers 1 to rollers, (6) and (7) are hard disk dedicated boats, and (8) are hard disk drives. ) is the system data bus, and c) is the CPU.

Next, the operation of the conventional example described above will be explained.

In the conventional technology, the CPU (9) is connected to hard disk dedicated ports (6) and (7) of the hard disk controller (5).
) can only be connected to hard disk devices (1) and (2). Therefore, only the number of hard disk drives (2) can be connected to the hard disk dedicated boats (6) and (7).

Hard disk device (1) output from CPU (9)
), (2) is sent to the hard disk controller (5) via the system data bus (8), and the data is sent to the hard disk dedicated board 1i6) or (7) that requested the write. Write data to hard disk device (1) or (2).

[Problem to be Solved by the Invention] In the conventional computer system as described above, the number of hard disk devices is fixed, and there is a problem in that the data written to the hard disk device cannot exceed the capacity of the hard disk device. there were.

This invention was made to solve the above-mentioned problem. If the capacity of the hard disk drive is exceeded, an empty hard disk drive can be easily connected to empty the overflow data. The purpose of this invention is to obtain a computer system that can write to a hard disk device.

[Means for Solving the Problems] A computer system according to the present invention includes the following means.

(1) Connected to a CPU via a system data bus and connected to a plurality of disk devices so as to be able to be dynamically switched, and when an access request is received from the CPU, one of the plurality of disk devices is connected. a disk controller that makes a logical connection between one and the CPU;

[Operation] In the present invention, when an access request is made from the CPU by a disk controller connected to the CPU via a system data bus and connected to a plurality of disk devices so as to be able to dynamically switch, Then, one of the plurality of disk devices and the CPU are logically connected.

[Embodiment] The configuration of an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a block diagram showing one embodiment of the present invention, and the system data bus (8) and CPU (9) are exactly the same as those of the conventional system.

In Figure 1, (5A) is a hard disk controller, (10) is a data bus, (11), (12), (1
3) and (14) are hard disk devices.

By the way, in the above-described embodiment of the present invention, the plurality of disk devices of the present invention include the hard disk devices (11) to
(14), and the disk controller is a hard disk controller (5A) in one embodiment of the present invention.
).

Next, the operation of the above-described embodiment will be explained.

One embodiment of this invention is a hard disk controller (
5A) and the hard disk devices (11) to (14), a data bus (10) connectable to an unspecified number of hard disk devices is provided.

A write or read request from the CPU (9>) is transmitted to the hard disk controller (5A) via the system data bus (8).

The hard disk controller (5A) makes a logical connection to the hard disk device requested by the CPU (9) from among the currently connected hard disk devices (11) to (14).

Access to the hard disk devices (11) to (14) is as follows:
The hard disk devices (11) to (14) are given predetermined consecutive numbers, and the numbers are accessed.

Here, there is always one hard disk device on which reading and writing are actually performed. Therefore, all hard disk drives other than those requested must be logically disconnected using a HOLD signal or a similar control signal.

At this time, if the hard disk device that issued the request is not physically connected, an error is returned to the CPU (9). If it is physically connected, the logical connection is also successful, and the CPU (9) and hard disk drive are connected successfully. i
Data is transmitted and received with any one of F (11) to (14).

As described above, an embodiment of the present invention is configured such that hard disk devices (11) to (14) can be dynamically connected to an unspecified number of hard disk devices (1, 1) to (14).
) and the hard disk controller (5A), the user can easily select the capacity of the hard disk device that suits the user, and remove it.
This has the effect that it can be easily connected to other computers.

In addition, in the above embodiment, the hard disk controller (5
A data bus (10) is provided between A) and the hard disk drives W (1,1) to (14), but the same operation can be expected even if a LAN or wide area line is used instead.

In the above embodiment, a heart disk device was used as a connection target, but a floppy disk, an optical disk, a CD
It goes without saying that the intended purpose can be achieved even with a ROM device.

[Effects of the Invention] As explained above, the present invention provides a CPU, a plurality of disk devices capable of storing data, and a CPU.
is connected to U via a system data bus, and is connected to the plurality of disk devices so as to be able to dynamically switch between them, and when an access request is received from the CPU, one of the plurality of disk devices It is equipped with a disk controller that makes a logical connection with the CPU, so if the capacity of the hard disk drive is exceeded, you can easily connect an empty hard disk drive and empty the overflow data. This has the effect that it can be written to a hard disk device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional computer system. In the figure, (5A)... Hard disk controller, (8
) ... System data bus, (9) -CPU (10) - Data bus, (11) to (14) ... Heart disk device. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a CPU, a plurality of disk devices capable of storing data, and a computer connected to the CPU via a system data bus, connected to the plurality of disk devices so as to be dynamically switchable, and accessed by the CPU. A computer system comprising: a disk controller that logically connects one of the plurality of disk devices and the CPU when requested.