JPH04256121A - Disk device - Google Patents

Abstract

PURPOSE:To enable a disk device to perform its processing in a double write subsystem state for a long period of time by providing an interface controller which can perform the direct transfer of data between 1st and 2nd electronic disk devices. CONSTITUTION:A disk device 10 consists of the electronic disk devices 1 and 2 containing the semiconductor devices as their memory parts end an electronic disk processor 3 so as to form a double write subsystem. Both devices 1 and 2 start the reed operations at each fixed time through the microprocessor circuits 12 and 22. When the ECC circuits 14 and 24 detect the data on the uncorrectable errors produced by the error correction codes, the correction data are reed out of the device 1 or 2 via the copy interface control circuits 13 and 23. Then the data on the uncorrectable errors are rewritten and can be corrected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, and in particular, detects and corrects uncorrectable error data using an error correction code during a read operation in an electronic disk device while operating with a dual write subsystem configuration. Regarding the disk device used.

0002

2. Description of the Related Art In a conventional disk device, when data with an error that cannot be corrected by an error correction code is detected during a read operation in the electronic disk device while operating with a dual write subsystem configuration, a correcting means is provided. I didn't have it.

0003

[Problems to be Solved by the Invention] In the conventional disk device described above, when data with an error that cannot be corrected by an error correction code is detected during a read operation in the electronic disk device while operating with a dual write subsystem configuration. Since the electronic disk processing device did not have a means to correct the error, if data with an error that cannot be corrected by the error correction code occurs in response to access from the electronic disk processing device, the electronic disk processing device The first data generated
There is a problem in that it is necessary to disconnect the first electronic disk device or the second electronic disk device and continue processing with the remaining electronic disk device configured as a single-write subsystem.

[0004] An object of the present invention is to provide a method that can be saved even if data with an error that cannot be corrected by an error correction code is saved when it is saved from the other electronic disk device.
It is an object of the present invention to provide a disk device in which data with errors that cannot be corrected by an error correction code is less likely to occur when accessed from a host device.

[0005]

[Means for Solving the Problems] A disk device of the present invention is provided between first and second electronic disk devices, and between the first and second electronic disk devices and a higher-level device, so as to write and read data. A disk device capable of configuring a dual-write subsystem including an electronic disk processing device to be controlled, comprising an interface control device that enables data to be directly exchanged between the first and second electronic disk devices. be.

[0006] The disk device of the present invention has first and second disk drives.
An electronic disk device includes a memory circuit that stores data and error correction codes, and an error correction code generation and correction circuit that generates error correction codes to be stored in the memory circuit and detects and corrects errors using the error correction codes. and when the error correction code generation/correction circuit detects data of an error that cannot be corrected by the error correction code, the correction data is read from another electronic disk device via the interface control circuit and the data of the error that cannot be corrected is read. may be rewritten to the normal state.

[0007] The disk device of the present invention has first and second disk drives.
A control circuit in an electronic disk device reads data in a memory circuit at predetermined time intervals, corrects errors in an error correction code generation and correction circuit, and corrects errors that cannot be corrected by the error correction code in the error correction code generation and correction circuit. If data is detected, corrected data may be read from another electronic disk device via the interface control circuit and the uncorrectable error data may be rewritten to a normal state.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The disk device 10 is composed of an electronic disk device 1 whose storage portion is a semiconductor device, an electronic disk device 2, and an electronic disk processing device 3, and can constitute a dual write subsystem. Electronic disk processing device 3
When writing data from the electronic disk device 1
When simultaneously writing to and reading from the electronic disk device 2, reading is performed from either the electronic disk device 1 or the electronic disk device 2, whichever is the main one.

The internal configurations of the electronic disk device 1 and the electronic disk device 2 are the same, and include electronic disk interface control circuits 11 and 21 that control the interface with the electronic disk processing device 3, and the electronic disk device 1 and the electronic disk device 2. Copy interface control circuits 13 and 23 that control the interface of , memory circuits 16 and 26 that store data and error correction codes, and memory circuit 16
, 26, and error correction code generation and correction circuits (hereinafter referred to as ECC generation and correction circuits) 14 and 24 that detect and correct errors using the error correction codes;
Microprocessor circuits 12 and 22 that perform read operations on memory circuits 16 and 26 at regular intervals, and memory circuit 1
Address counter 1 that counts 6, 26 addresses
5, 25.

Next, the operation of correcting data with uncorrectable errors using the error correction code of the present invention will be explained.

The microprocessor circuit 12 of the main electronic disk device 1 or the electronic disk device 2 (electronic disk device 1 in this example) checks the operation history at regular intervals, and during this period the electronic disk device If no write or read operation has been performed from the processing device 3, the copy interface control circuit 13 sends data to the microprocessor circuit 22 at regular intervals via the copy interface control circuit 23 of the other electronic disk device 2. The start of the read operation is reported and the read start address is set in the memory address counter 15. Furthermore, the microprocessor circuit 22 that has been notified of the start of the read operation at fixed time intervals of the other electronic disk device 2 also sets a read start address in the memory address counter 25. The address set at this time is the same for the electronic disk device 1 and the electronic disk device 2. In this way, the electronic disk device 1 and the electronic disk device 2
The microprocessor circuits 12 and 22 start reading operations at regular intervals, and the ECC generation and correction circuits 14 and
24, when data with an error that cannot be corrected by the error correction code is detected, the copy interface control circuits 13 and 2
3 to the electronic disk device 1 or the electronic disk device 2
The error data that cannot be corrected is corrected by reading correction data from and rewriting the data that contains the uncorrectable error.

[0014]

[Effects of the Invention] As explained above, the present invention detects and corrects uncorrectable error data using an error correction code during read operation in an electronic disk device while operating with a dual write subsystem configuration. As a result, without interfering with access from the electronic disk processing device, data with errors that cannot be corrected by error correction codes are less likely to occur when accessed from the host device, and double writing is possible for a longer period of time than with conventional electronic disk devices. This has the effect of allowing processing to be performed in the subsystem state.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

[Explanation of symbols]

1, 2 Second electronic disk device 3 Electronic disk processing device 10 Disk devices 11, 21 Electronic disk interface control circuit 12, 22 Microprocessor circuit 13, 2
3 Copy interface control circuit 14, 24
Error correction code generation/correction circuit (ECC generation/correction circuit) 15, 25 Memory address counter 16, 26
memory circuit

Claims (3)

[Claims] 1. A dual electronic disk drive system comprising first and second electronic disk devices, and an electronic disk processing device that is provided between the first and second electronic disk devices and a host device and controls data writing and reading. What is claimed is: 1. A disk device capable of configuring a writing subsystem, characterized by comprising an interface control device that enables data to be directly exchanged between the first and second electronic disk devices. 2. A memory circuit in which the first and second electronic disk devices store data and error correction codes;
an error correction code generation and correction circuit that generates an error correction code to be stored in the memory circuit and detects and corrects errors caused by the error correction code; 2. The disk device according to claim 1, wherein when data with a possible error is detected, correction data is read from another electronic disk device via an interface control circuit and the data with the uncorrectable error is rewritten to a normal state. . 3. A control circuit in the first and second electronic disk devices reads data in the memory circuit at predetermined time intervals and corrects errors in the error correction code generation and correction circuit, and the error correction code generation and correction circuit corrects the error. If data with an error that cannot be corrected by the error correction code is detected, correction data is read from another electronic disk device via an interface control circuit and the data with the uncorrectable error is rewritten to a normal state. The disk device according to claim 1.