JPS59105161A - Computer system - Google Patents

Abstract

PURPOSE:To improve the processing ability of the whole system without exerting influences upon other disc storage devices even if a positioning error is generated in one disc storage device by providing a positioning operation retrial function to each disc storage device independently. CONSTITUTION:Magnetic discs D1-Dn have positioning operation retrial circuits E1-En having positioning operation retrial functions independently. If a positioning error is generated in the magnetic disc D1, the contents indicating the generation of the error and the execution of the retrial operation are informed to a controller 2. Receiving the information, the controller 2 disconnects the connection with the disk D1 temporally and waits until the completion of the retrial. Therefore, it is unnecessary for the controller 2 to detect the error and the controller 2 can transmit/receive information to/from other magnetic discs D2-Dn. After completion of the retrial by the magnetic disc D1, the magnetic disc D1 informs the completion to the controller 2.

Description

[Detailed Description of the Invention] [Technical Clarification of the Invention] The present invention provides a disk storage bag uq as an external storage device.
The present invention relates to a computer system that includes a plurality of storage devices that use disks as recording media, such as magnetic disk devices.

[Prior art]

First, a conventional system of this type will be briefly explained using FIG.

In Figure 1, (1) is the central processing unit, and (2) is the central processing unit that is interposed between the central processing unit (1) and a plurality of magnetic disk devices (hereinafter simply referred to as magnetic disks) (DI) to (Dn). A magnetic disk controller equipped with a positioning operation retry circuit (3) that itself has a positioning operation retry function
(hereinafter simply referred to as controller). Note (1)
- (3) constitute a computer main body (4).

Next, the operation will be explained.

For example, when the central processing unit (1) attempts to import and process information stored on the magnetic disk (Dl), the central processing unit (1) first instructs the controller (2) to store the desired information before instructing the controller (2) to read the information. Issue a positioning command to a location. When the controller (2) receives the positioning command, it selects (Dl) from among the magnetic disks (Dl) to (Dn) and instructs the positioning operation. Upon receiving the positioning instruction, the magnetic disk (Dl) performs a positioning operation in which certain information is stored.

When the positioning operation is completed, the magnetic disk (Dl) reports completion to the controller (2). When the controller (2) receives the completion report, the controller (2) then issues a read instruction to the magnetic disk (Dl). Through 11 or more operations, the information stored in the magnetic disk (Dl) is transferred to the central processing unit ( 1) and processed.

Since a conventional computer system having a magnetic disk and a controller is configured as described above, even if a positioning error occurs in the magnetic disk (Dl), the error can be detected by the controller (2). The controller (2) will also issue instructions to retry the process. Therefore, while the controller (2) is monitoring the success or failure of the retry, it cannot exchange information with other magnetic devices or disks, and this is one of the major factors that reduces the processing power of the entire computer system. It has become.

[Summary of the invention]

The purpose of this invention is to provide a system that improves the problems of conventional computer systems as described in section 2 above. Even if a positioning error occurs in one disk storage device, information can be exchanged with other disk storage devices connected to the same disk controller without having to wait for a retry to be completed. It is.

[Embodiments of the invention]

This invention will now be described in detail with reference to FIG.

In Fig. 2, (1), (2), and (4) are the same parts as in Fig. 1.

(Dl) to (Dn) are magnetic disks, but they are different from those in FIG. That is, in FIG. 1, the controller (
The positioning operation retry circuit (3) having the positioning operation retry function provided in 2) is independently provided. In Fig. 2, the positioning operation retry circuit is (
El) to (E n, ).

For example, when the central processing unit (1) imports and processes information from the magnetic disk (Dl), the controller (
The system is the same as the conventional system until the controller (2) receives the command and selects (Dl) from among multiple magnetic disks, but if a positioning error occurs in the magnetic disk (Dl), the controller (2) ) to report that an error has occurred and a retry operation will be started 7. Control “1-La (2)
When it receives this report, it temporarily disconnects from the magnetic disk (Dl) and waits until the retry is completed. Since the positioning operation retry function from 1 to 1 is independent on the magnetic disk side, controllers 0 and 1 do not need to detect errors, so they can perform different operations. Information can be exchanged with other magnetic disks (D2) to (Dn). Next, when the retry is completed on the magnetic disk (Dl), a completion report is sent to the controller (2). When the receiver receives this report, the controller (2
) issues a read instruction to the magnetic disk (Dl) at the time when the exchange of information with the other magnetic disks (D2) to (Dn) ends.

As it operates as described above, the problem of not being able to exchange information with all other magnetic disks due to positioning error detection and retry management of one magnetic disk is eliminated, and the entire 29-machine system is eliminated. The processing capacity of the system will also improve.

Although the above embodiment describes a computer system using a magnetic disk device as a disk storage device,
An optical disc storage device such as a laser disc memory can be similarly implemented.

〔Effect of the invention〕

As described above, according to the present invention, each disk storage device is provided with a positioning operation retry function independently, so that all other disk storage devices can be used to detect positioning errors and manage retry operations. The problem of not being able to exchange information with the disk storage device is eliminated, and the processing capacity of the entire computer system is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional system, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, (1)...Central processing unit, (2)...Magnetic disk control device, (3)...Positioning operation retry circuit, (4)...Computer main body, (Dl) to ( Dn)...Magnetic disk device, (El)-(En)...Positioning operation retry circuit provided independently in the magnetic disk device. In addition, the same reference numerals are attached to the same or equivalent parts in the figures. Agent Shin Kuzuno - Figure 1

Claims (1)

[Claims] In a computer system that is equipped with a plurality of disk storage devices as external storage devices and configured to arbitrarily select one of the plurality of storage devices to exchange information with the computer, each of the plurality of disk storage devices has a A positioning error retry circuit is provided, and when each disk storage device requires a retry for positioning operation, each disk storage device has a
By retrying independently by the retry circuit with ~, the position ω1
A computer system characterized in that when a decision operation is successful, a report to that effect is sent to a central processing unit.