JPS59116867A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To disconnect a magnetic disk and to execute accurately a self-test of controller with good reproducibility by providing a storage circuit which allows recording and reading through an interface equivalent to that of the magnetic disk and an input/output control circuit which sets the simulation state of the magnetic disk in the storage circuit. CONSTITUTION:The magnetic disk 1, magnetic disk controller 2, and a simulation magnetic disk circuit which has the same interface with the disk 1 are provided. This circuit 3 consists of the storage circuit 4 and input/output circuit 5 which controls the input/output operation of the circuit 4, and is connected to the control circuit 2 by a switching circuit 6. This control circuit 5 sets the simulation state of the disk 1 in the circuit 4 and the controller 2 and disk 1 are normally connected together by the circuit 6. When a fault is analyzed, the circuit 6 disconnects the disk 1 and the controller 2 is tested accurately by the simulation state set in the circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device that allows functional diagnosis and failure analysis of a control device itself with the magnetic disk separated.

[Prior art]

In a data processing system, if an abnormality occurs in the operation of a magnetic disk device, even if the magnetic disk device has a self-test function, the function is based on a method of checking the writing and reading of test data on the magnetic disk. It was difficult to diagnose whether the cause was the magnetic disk or the control device. On the other hand, during maintenance of the device, if an abnormality occurs in the magnetic disk, it is necessary to thoroughly check the operation of the control device and the special functions it has. However, with the conventional self-test function, it is difficult to intentionally cause an abnormal state on the magnetic disk, and since it is a mechanical device, it is difficult to set the conditions with certainty.
Reproducibility was also poor.

[Purpose of the invention]

An object of the present invention is to provide a magnetic disk device that allows functional diagnosis and failure analysis of the magnetic disk control device itself with the magnetic disk separated.

[Summary of the invention]

In order to achieve the above object, the present invention includes a storage circuit that can record and read data using an interface equivalent to a magnetic disk, and an input/output control circuit that can set a simulated state of the magnetic disk for this storage circuit. It is that you are.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, in which a simulated disk circuit 3 having the same interface as the magnetic disk is provided for a conventional magnetic disk device consisting of a magnetic disk 1 and a control device 2.

The simulated disk circuit 3 includes a memory circuit 4 and a memory circuit 4.
It is composed of an input/output control circuit 5 that controls the input and output of the controller, and can be connected to the control device 2 through a switching circuit 6.

In normal times, the magnetic disk controller 2 is connected to the magnetic disk 1, but when analyzing the cause of a failure or checking the functionality of the magnetic disk controller, the connection is switched to the simulated disk circuit 3. Perform the action.

The storage circuit 4 has a capacity t' equivalent to several cylinders of a magnetic disk, and by setting one cylinder as an index cylinder and the other as a data cylinder, the special function of the alternating cylinder processing and multi-cylinder processing of the control device 2 is realized. It can also be used for testing.

On the other hand, the input/output control circuit 5 generates recording/reading synchronization pulses corresponding to the number of rotations of the magnetic disk 1 to the storage circuit 4, and performs recording/reading, address designation, etc. based on control signals from the magnetic disk controller 2. and input/output data timing control, and also generates a signal indicating the normal/abnormal state of the magnetic disk 1 in a simulated manner (-1) It is possible to fully confirm the operation of the magnetic disk controller 2 with reproducibility.

The switching circuit 6 can be operated manually or by the magnetic disk controller 2.
In the latter case, it is possible to perform online failure analysis and functional diagnosis at the time of startup of the magnetic disk drive and by making use of all available time.

An embodiment of the present invention is shown in its entire configuration in FIGS. 2 and 3, and its operation will be fully explained below.

! FIG. 2 shows an embodiment in which the simulated disk circuit 3 has nine configurations independent of the magnetic disk control bags # and 2. This embodiment shows a case where a simulated disk circuit is used by switching the magnetic disk 1 through the connector 7 during maintenance and failure analysis. The storage circuit 4, which records and reads data in the same serial data format as the magnetic disk 1, uses a random access memory 8, an input buffer 9 that controls the timing of input and output serial data, and an output buffer 10.
It consists of When recording data, the input buffer 9 monitors the timing of the recording data signal from the magnetic disk controller 2 with respect to the clock, and when reading data, the output buffer 10 monitors the input timing margin for the read data signal of the controller 2. Check everything. The input/output control circuit 5 includes a clock signal generator 11 that generates a recording/reading clock signal corresponding to a rotation synchronizing pulse of the magnetic disk, and a clock signal generator 11 that uses the clock signal as an input to count one rotation of the magnetic disk and sends it to the random access memory 8. a counter 12 that generates an address signal; a status setting section 13 that simulates the state of the magnetic disk and generates an interface signal corresponding to the setting signal; a display section 14 that displays the setting signal; and a magnetic disk control device. 2 and the setting signal to the random access memory 8.
Track counter 15 that specifies the recording/reading area of
, and a unit selector 16.

When performing functional diagnosis and failure analysis, first the status setting section 13
Then, data cylinder areas are allocated to the random access memory 8, areas where recording and reading are prohibited are set, and unit numbers and defective tracks are set. The cough setting signal is displayed on the display section 14 and is also given to the track counter 15 and unit selector 16. The unit selector 16 sends a ready signal to the control device 2 in response to a unit select signal from the magnetic disk control bag f2. The track counter 15 counts head movement signals output from the control device during a seek operation, and specifies areas in the random access memory 8 corresponding to the index cylinder, data cylinder, and alternate cylinder based on the setting signal.

By using a simulated disk circuit that performs the above operations, the operation of the magnetic disk splitting device can be confirmed with high reliability without involving a mechanical mechanism, and the failure location of the control/device can be separated from the magnetic disk side and clarified. It is possible to diagnose the input/output data timing, alternate cylinder processing, multi-cylinder processing, and retry functions of the control device, which cannot be realized by functional diagnosis using a magnetic disk.

Figure 3 shows a simulated disk circuit 3 in a magnetic disk controller 2.
This shows an example in which the following is added.

The memory circuit 4 has the same configuration as in the previous embodiment.

The input/output control circuit 5 includes a status setting section 13, a display section 14, and a track counter 15. At the time of functional diagnosis and failure analysis, the switching circuit 6 is set to the simulated disk circuit 3 side according to a signal from the arithmetic processing section 17 in the magnetic disk control device, and the simulated state of the magnetic disk is set in the state setting section 13.

Display unit 14/track counter 15 for the setting signal
The operational functions are the same as in the previous embodiment. Address generation according to the rotational pulse of the magnetic disk applied to the storage circuit 4 is provided by a clock generator 18 and a bridle index counter 19 inside the magnetic disk control device 2 .

The operation of the simulated disk circuit according to this configuration is the same as that of the above embodiment, but by using the circuit in the magnetic disk control device, the number of components of the simulated disk circuit can be reduced, and failure analysis can be performed online.・Functional diagnosis can be performed by making full use of the free time of the magnetic disk device.

〔Effect of the invention〕

According to the present invention, a self-test of nine operations including special functions of a magnetic disk control device can be executed with high accuracy and reproducibility.
It is possible to maintain high reliability of the control device.

[Brief explanation of drawings]

FIGS. 1 to 3 are block diagrams of an embodiment of a magnetic disk device according to the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic disk, 2... Magnetic disk control device, 3... Simulated magnetic disk circuit, 4... Storage circuit,
5... Input/output control circuit.

Claims (1)

[Claims] In a magnetic disk device consisting of a magnetic disk and a magnetic disk control device that controls the magnetic disk, there is provided a storage circuit capable of recording and reading operations using an interface equivalent to the magnetic disk, and a simulated state of the magnetic disk can be set in the storage circuit. 1. A magnetic disk device comprising an input/output control circuit so that functional diagnosis and failure analysis of only the magnetic disk control device can be performed with the magnetic disk disconnected.