JPH0876936A - Auxiliary storage - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide an auxiliary storage device which is less likely to accidentally replace a normal magnetic disk storage device by a failed disk replacement operation. [Structure] A plurality of magnetic disk storage devices 1 that can be individually attached / detached in an energized state, a disk control unit 2 having a function of individually detecting a failure of the magnetic disk storage device, and one of the magnetic disk storage devices When a failure occurs, the central processing unit MP that uses the data of another normal magnetic disk storage device to restore the data of the failed magnetic disk storage device
In the auxiliary storage device having U, a lock portion 3 for preventing disengagement, which is laid one-to-one with the attachment / detachment portion of the magnetic disk storage device, and the open / closed state of each lock portion are detected to be transferred to the central processing unit. A lock open / close detection unit 4 is provided, and when the lock open / close detection unit corresponding to a normal magnetic disk storage device transmits the unlocked state of the lock unit, an alarm is issued by an alarm device to erroneously normal magnetic disk storage. Prevents the device from being detached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk storage device used as an auxiliary storage device of an electronic computer or the like, and more particularly to an improvement for improving reliability as a redundant configuration.

[0002]

2. Description of the Related Art In a magnetic disk storage device, when a drive fails, it becomes difficult to reproduce the data stored in the drive, and the operation must be stopped. However, in a magnetic disk storage device for business use, even if a certain drive fails, there is a demand for continuing the operation and reproducing data. Therefore, a plurality of magnetic disk storage devices have a redundant configuration, and mirroring and duplexing for storing the same data in the plurality of magnetic disk storage devices, and striping for performing error correction using a checksum value are known.

FIG. 3 is a block diagram of a conventional device.
In the figure, a magnetic disk storage device 1 is a so-called hard disk storage device, and n units 1a, 1b, ..., 1n are provided in parallel here. The disk control unit 2 is provided one-to-one with each magnetic disk storage device 1,
Controls reading and writing of data. The MPU is a microprocessor, and accesses the magnetic disk storage device 1 via each disk control unit 2 to exchange data. When the MPU detects an inconvenience such as a power failure in the system, the alarm device 6 issues an alarm to alert the operator.

FIG. 4 is a diagram for explaining the procedure of maintenance work of the magnetic disk storage device. In normal operation,
, 2n are read from / written to the magnetic disk storage devices 1a, 1b, ..., 1n via the respective disk control units 2a, 2b, ..., 2n (S1). Here, if a failure occurrence is detected in any of the magnetic disk storage devices (S
2), the failed magnetic disk storage device 1k (1 ≦ k ≦
The disk controller 2k in charge of n) reports the disk failure to the MPU (S3). Then, the MPU operates while recovering the data in the magnetic disk storage device 1k by using the data in the normal magnetic disk storage device 1 other than the magnetic disk storage device 1k that failed at the time of reading (S4). This work is a failed magnetic disk storage device 1
It continues until k is replaced with the normal magnetic disk storage device 1 (S5). Then, when the failed magnetic disk storage device 1k is replaced with the normal magnetic disk storage device 1 (S7), the normal operation state is restored.

[0005]

However, there is a case where the normal magnetic disk storage device 1 is mistakenly replaced in the disk replacement work (S10). Then, it is assumed that the normal magnetic disk storage device 1k + 1 is actually removed from the system by mistake (S11). Then, since the magnetic disk storage device 1k is out of order and the magnetic disk storage device 1k + 1 is also removed from the system, the two magnetic disk storage devices 1 are lost and the MPU cannot recover the data. (S12). Therefore, the system is down (S13), and there has been a problem that the error correction technology of the corner angle cannot be exhibited.

An object of the present invention is to solve such a problem, and an object thereof is to provide an auxiliary storage device which is less likely to mistakenly replace a normal magnetic disk storage device by a failed disk replacement operation.

[0007]

SUMMARY OF THE INVENTION The present invention to achieve the above object is to provide a plurality of magnetic disk storage devices 1 which can be individually attached and detached in an energized state, and which are connected to the magnetic disk storage devices in a one-to-one correspondence. A disk control unit 2 that controls reading and writing of data from and to the disk storage device, detects a failure of the magnetic disk storage device, and another normal magnetic disk storage device when one of the magnetic disk storage devices fails. In the auxiliary storage device having a central processing unit MPU for repairing the data of the failed magnetic disk storage device by using the above data, a lock part 3 for preventing separation, which is laid one-to-one with the attachment / detachment part of the magnetic disk storage device. When,
A lock open / close detection unit 4 that detects the open / closed state of each lock unit and is provided to the central processing unit, and an alarm device 6 that issues an alarm in response to a command from the central processing unit are provided. When the unlocked state of the lock unit is transmitted from the lock open / close detection unit corresponding to the magnetic disk storage device, an alarm is issued from the alarm device.

[0008]

According to the structure of the present invention, when replacing the magnetic disk storage device, the lock portion is released before the magnetic disk storage device is removed, and then the individual magnetic disk storage device is attached or detached. Therefore, when the defective magnetic disk storage device is replaced, if the corresponding lock portion is in the unlocked state, there is no problem even if the replacement is performed, and no alarm is issued from the alarm device. On the other hand, if you accidentally try to replace a normal magnetic disk storage device, the lock open / close detection unit detects that the corresponding lock unit is in the unlocked state, and an alarm is issued from the alarm device This prevents the removable magnetic disk storage device from being attached or detached. This ensures error correction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a configuration block diagram of an auxiliary storage device showing an embodiment of the present invention. Incidentally, in FIG. 1, components having the same functions as those in FIG. In the figure, the lock portions 3 are laid one-to-one on the attachment / detachment portion of the magnetic disk storage device 1, and prevent the attachment / detachment portions such as connectors from coming off in the locked state. Lock open / close detector 4
Detects the open / closed state of each lock unit 3 and sends it to the MPU.
Here, each magnetic disk storage device 1a, 1b, ..., 1n
, 3n and lock open / close detection units 4a, 4b, ..., 4n respectively. When the unlocked state of the lock unit 3k + 1 is transmitted from the lock open / close detection unit 4k + 1 corresponding to the magnetic disk storage device 1k + 1 other than the failed magnetic disk storage device 1k, the MPU sends an alarm device 6 An alarm is issued to alert the operator.

FIG. 2 is a diagram for explaining the procedure of maintenance work of the apparatus of FIG. In FIG. 2, components having the same functions as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted. First, in S10, the failed magnetic disk storage device 1
Consider a case in which k is to be replaced with a normal magnetic disk storage device 1. Then, since the operator releases the lock portion 3k, the MPU does not instruct the alarm device 6 to generate an alarm (S21). Then, the operator replaces the failed magnetic disk storage device 1k with a normal magnetic disk storage device 1 (S22). Then, the operator closes the lock portion 3k (S23) and returns to the normal operating state.

Now, let us consider a case where the normal magnetic disk storage device 1k + 1 is mistakenly replaced in the disk replacement work. First, the operator accidentally releases the lock unit 3k + 1 of the normal magnetic disk storage device 1k + 1 (S3).
1). Then, the MPU knows from the lock open / close detection unit 4k + 1 that the lock unit 3k + 1 has been released, and therefore outputs an alarm request signal to the alarm device 6 (S32). In response to this, the alarm device 6 sounds an alarm based on the alarm request signal (S33). Upon hearing this warning, the operator recognizes that the magnetic disk storage device 1k + 1 to be replaced is wrong (S34). Therefore, when the operator relocks the lock part 3k + 1 which has been released (S35), the alarm of the alarm device 6 is stopped (S36). Then, the failed magnetic disk storage device 1k is replaced with a normal magnetic disk storage device 1 (S21 to S23).

[0012]

As described above, according to the present invention, when the operator accidentally tries to replace the normal magnetic disk storage device 1k + 1 when replacing the failed magnetic disk storage device 1k. Since the error is recognized using the signal from the lock open / close detector 4k + 1 and the alarm is issued by the alarm device 6, erroneous replacement work by the operator is prevented. Therefore, there is an effect that the reliability of the highly reliable auxiliary storage device that enables data restoration by making it redundant can be maintained high.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of an auxiliary storage device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a procedure of maintenance work of the apparatus of FIG.

FIG. 3 is a configuration block diagram of a conventional device.

FIG. 4 is a diagram illustrating a procedure of maintenance work of the magnetic disk storage device.

[Explanation of symbols]

 1 magnetic disk storage device 2 disk control unit 3 lock unit 4 lock open / close detection unit 6 alarm device MPU central processing unit

Claims (1)

[Claims] 1. A plurality of magnetic disk storage devices (1) that are individually removable in an energized state, and are connected to the magnetic disk storage device in a one-to-one relationship to control reading and writing of data from the magnetic disk storage device. A disk control unit (2) for detecting a failure of the magnetic disk storage device, and a failed magnetic disk storage using data of another normal magnetic disk storage device when one of the magnetic disk storage devices fails. Central processing unit (M
PU) and a lock unit (3) for preventing disengagement, which is laid one-to-one with the attach / detach unit of the magnetic disk storage device, and the central processing by detecting the open / closed state of each lock unit. A lock open / close detection unit (4) provided in the device and an alarm device (6) for issuing an alarm in response to a command from the central processing unit are provided, and the lock open / close corresponding to a magnetic disk storage device other than the failed magnetic disk storage device is provided. An auxiliary storage device, wherein an alarm is issued from the alarm device when the unlocked state of the lock part is transmitted from the detection part.