JPH03218513A - Computer system - Google Patents

Abstract

PURPOSE:To surely guarantee the content of a fixed disk by stopping access to all the fixed disks by means of a computer, and separating the fixed disks at the time of separating the fixed disks on the way of operating online. CONSTITUTION:When an operation signal from separation request switches 7 and 8 corresponding to the fixed disks 3 and 4 is inputted to a switching control means 9 at the time of separating the fixed disks 3 and 4 on the way of operating online, a separation request signal is outputted from the switching control means 9 to the computer 1. Then, access for all the fixed disks 3 and 4 is stopped in the computer 1, and a separation permission signal is outputted to the switching control means 9. Thus, a computer system which can surely guarantee the content of the fixed disks and whose reliability is high can be obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a computer system configured by connecting at least one fixed disk to a computer via a bus,
In particular, the present invention relates to a computer system that can reliably guarantee the contents of a fixed disk when the fixed disk is disconnected during online operation.

(Prior Art) In recent years, computer systems have been widely used in various industrial fields, for example, for the purpose of processing various information. This type of computer system is usually configured with at least one fixed disk connected via a bus.

By the way, in such a computer system, when disconnecting a fixed disk that is online, conventionally the fixed disk is disconnected at any time. For this reason,
If the fixed disk was being accessed when the fixed disk was detached, the contents of the fixed disk were not guaranteed.

(3! Ifi that the invention attempts to solve) As mentioned above,
Conventional computer systems have a problem in that the contents of the fixed disk are not guaranteed when the fixed disk is disconnected while online.

An object of the present invention is to provide an extremely reliable computer system that can reliably guarantee the contents of a fixed disk when the fixed disk is disconnected during online operation.

[Configuration of the Invention (Means for Solving the Problem) In order to achieve the above object, the present invention provides a computer system configured by connecting at least one fixed disk to a computer via a bus. When an operation signal is input from a disconnection means provided corresponding to each fixed disk, which performs an operation of disconnecting the fixed disk from the bus, and a detachment request switch provided corresponding to each fixed disk, the computer A function to output a detachment request signal to the computer, a function to output an operation signal to the detachment means corresponding to the detachment permission signal when a detachment permission signal from the computer is input, and a function to complete detachment of the fixed disk by the detachment means. Then, the computer is equipped with a switching control means having a function of outputting a disconnection end signal to the computer, and when a disconnection request signal from the switching control means is input to the computer,
A function that stops access to all fixed disks and outputs a detachment permission signal to the switching control means, and, if necessary, when a detachment completion signal from the switching control means is input, access to other fixed disks. We are trying to provide a function to restart the .

(Function) Therefore, in the computer system of the present invention, when disconnecting a fixed disk while online, when an operation signal from the detachment request switch corresponding to the fixed disk to be detached is inputted to the switching control means, the switching is performed. A disconnection request signal is output from the control means to the computer. Then, the computer stops accessing all fixed disks and outputs a disconnect permission signal to the switching control means. As a result, an operation signal is outputted from the switching control means to the separating means corresponding to the detachment permission signal, and the corresponding fixed disk is separated, and at the same time, a detachment completion signal is outputted from the switching control means to the computer. Then, the computer resumes access to other fixed disks as necessary.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of a computer system according to the present invention. This computer system consists of a computer 1,
From a plurality of (two in this example) fixed disks 3 and 4 connected to the computer 1 via the bus 2, disconnectors 5 and 6, a disconnection request switch 7.8, and a switching control device 9. It consists of

Here, in addition to its original information processing function, when the computer 1 receives a disconnection request signal from the switching control device 9, it stops accessing all the fixed disks 3 and 4, and It has a function of outputting a detachment permission signal and a function of restarting access to the other fixed disk 4 or 3 when a detachment completion signal from the switching control device 9 is input. Also, the fixed disk 3.4 is the computer 1
It stores processing information, etc.

On the other hand, the separators 5.6 are provided corresponding to the fixed disks 3.4, and the bus 2 of the fixed disks 3.4.
This device performs a disconnection operation for the wire, and is composed of, for example, a relay or the like. Further, the detachment request switches 7 and 8 are provided corresponding to the fixed disks 3 and 4, respectively, and are operated to output an operation signal when the corresponding fixed disks 3 and 4 are to be detached. Furthermore, the switching control device 9 has a function of outputting a disconnection request signal to the computer 1 when an operation signal from the disconnection request switch 7.8 is input, and a function of outputting a disconnection request signal to the computer 1 when a disconnection permission signal is input from the computer 1. A function of outputting an operation signal to the separators 5 and 6 corresponding to the separation permission signal, and a function of outputting a separation completion signal to the computer 1 when the separation of the fixed disks 3 and 4 by the separators 5 and 6 is completed. It has the following.

Next, the operation of the computer system configured as described above will be explained using the flow diagram shown in FIG.

In the computer system shown in FIG. 1, when one of the fixed disks 3 is to be detached while online, the detachment request switch 7 corresponding to the fixed disk 3 to be detached is first activated.
When is pressed (step S1), an operation signal is output from the disconnection request switch 7 to the switching control device 9 (step S2). When the disconnection request signal is input from the switching control device 9 to the computer 1, the computer 1 stops accessing all fixed disks 3.4, and then outputs a disconnection permission signal to the switching control device 9 ( Step S3).

Then, an operation signal is output from the switching control device 9 to the separator 5 corresponding to this separation permission signal, and the separator 5 operates to separate the corresponding fixed disk 3 (step S4
). Next, a disconnection end signal is output from the switching control device 9 to the computer 1 (step S5). As a result, the computer 1 restarts access to the other fixed disk 4 (step S6).

On the other hand, when disconnecting one of the fixed disks 4 while online, first press and operate the detachment request switch 8 corresponding to the fixed disk 4 to be detached (step S1).
, an operation signal is sent from the disconnection request switch 8 to the switching control device 9
(Step S2). Then, the switching control device 1
When the disconnection request signal is input from 9 to computer 1, computer 1 stops accessing all fixed disks 3.4, and then outputs a disconnection permission signal to switching control device 9 (step S3). Then, an operation signal is output from the switching control device 9 to the separator 6 corresponding to this separation permission signal, and the separator 6 operates to separate the corresponding fixed disk 4 (step S4). Next, a disconnection end signal is output from the switching control device 9 to the computer 1 (step S5).
).

As a result, the computer 1 restarts access to the other fixed disk 3 (step S6).

As described above, in the computer system of this embodiment, when disconnecting one of the fixed disks 3 or 4 while online, the operation signal is switched from the detachment request switch 7 or 8 corresponding to the fixed disk 3 or 4 to be detached. A disconnection request signal is outputted to the control device 9, and the switching control device 9 gives a disconnection request signal to the computer 1, and the computer 1 disconnects all fixed disks 3.
, 4, the disconnector 5 or 6 is operated to disconnect the corresponding fixed disk 3 or 4, and the computer 1 resumes access to the other fixed disk 4 or 3 This is what I did.

Therefore, when fixed disks 3 and 4 are disconnected while online, access to fixed disks 3 and 4 is not being performed, so that the contents of fixed disks 3 and 4 can be reliably guaranteed. In addition, since the series of operations when disconnecting the fixed disk 3 or 4 is performed automatically, the time required to stop the bus 2 of the fixed disk 3 or 4 is shortened, thereby increasing the operational efficiency of the computer system. becomes possible.

In the above embodiment, the present invention is applied to a computer system in which two fixed disks are connected to the computer 1, but the present invention is not limited to this. The present invention can be applied in exactly the same way to a computer system formed by connecting a plurality of fixed disks as described above.

[Effects of the Invention] As explained above, according to the present invention, in a computer system configured by connecting at least one fixed disk to a computer via a bus, when the fixed disk is disconnected while online. In addition, since the fixed disk is detached after stopping access to all fixed disks by the computer, the contents of the fixed disk can be guaranteed even if the fixed disk is detached while online. , and an extremely reliable computer system that can improve system operation efficiency can be provided.

A block diagram showing an example, and FIG. 2 is a flow diagram for explaining the operation in the same embodiment.

DESCRIPTION OF SYMBOLS 1... Computer, 2... Bus, 3.4... Fixed disk, 5, 6... Disconnector, 7.8... Disconnection request switch, 9... Switching control device.

Claims (1)

[Scope of Claims] A computer system configured by connecting at least one fixed disk to a computer via a bus, wherein each of the fixed disks is provided corresponding to the fixed disk, and an operation for disconnecting the fixed disk from the bus is provided. and a function of outputting a disconnection request signal to the computer when an operation signal is input from a disconnection request switch provided corresponding to the fixed disk, and a function of outputting a disconnection permission signal from the computer. When input, a function of outputting an operation signal to the separation means corresponding to the separation permission signal, and when the separation of the fixed disk by the separation means is completed,
switching control means having a function of outputting a disconnection completion signal to the computer; further, when a disconnection request signal from the switching control means is input to the computer, stopping access to all fixed disks; A function of outputting a detachment permission signal to the switching control means and, if necessary, a function of restarting access to the other fixed disk when a detachment completion signal is input from the switching control means. A computer system characterized by