JPH0442462A - Magnetic disk subsystem - Google Patents

Abstract

PURPOSE:To enable a magnetic disk subsystem to be used regardless when a fault is repaired and to prevent data from being dissipated by forming the magnetic disk subsystem in double write constitution, connecting magnetic disk devices with an interface, and performing copy without interposing a magnetic disk processor. CONSTITUTION:The magnetic disk processor 1 is connected to the magnetic disk devices 3, 10 with a magnetic disk interface 2, and the magnetic disks 3, 10 store the same data. When the fault occurs in the magnetic disk device 10, the magnetic disk processor 1 permits only the magnetic disk 3 to be accessed, and sets the magnetic disk device 10 at an on-line state when the fault is recovered, and sends data in the storage part 6 of the magnetic disk device 3 to the magnetic disk device 10 by applying start-up from a control panel 11 to a copy interface control circuit 12, and stores it in a storage part 15. In such a way, the system can be used even when the fault occurs, etc., and the dissipation of stored data can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic disk subsystem, and particularly in a dual-write configuration, when a failure occurs in one magnetic disk device, the other magnetic disk device is placed in an online state. The present invention relates to a magnetic disk subsystem in which data is written as is, one failed magnetic disk device is repaired, and after the repair, data is copied from the other magnetic disk device through a copy interface without the intervention of a magnetic disk processing device.

[Conventional technology °]

Conventionally, this type of magnetic disk subsystem has a multi-write configuration and does not have an interface between magnetic disk devices for data copying.

[Problem to be solved by the invention]

The conventional magnetic disk subsystem described above did not have a dual-write configuration and did not have an interface between magnetic disk devices for data copying, so when a failure occurs, the magnetic disk is not used until the failure is recovered. The disadvantage is that the device cannot be used, and if a failure occurs in the data storage section, the stored data will be lost.

[Means to solve the problem]

A magnetic disk subsystem of the present invention includes a magnetic disk processing device, a first magnetic disk device that stores main data, and a second magnetic disk device that is used as a copy of the main data. A magnetic disk interface that connects the magnetic disk processing device, the first magnetic disk device, and the second magnetic disk device, and a magnetic disk interface that connects the first magnetic disk device and the second magnetic disk device. The first and second magnetic disk devices each have a storage section for storing data, and a storage section for temporarily storing a part of the data in the storage section when accessed from the magnetic disk processing device. A magnetic disk interface control circuit for controlling an interface with the magnetic disk processing device, a copy interface control circuit for controlling a copy interface with the magnetic disk, and an operation panel for inputting commands by an operator. It consists of

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

The magnetic disk processing device 1 is connected to a first magnetic disk device 3 and a second magnetic disk device 10 via a magnetic disk interface 2, and the first magnetic disk device 3 and the second magnetic disk device 10 are connected via a copy interface. 9 is connected.

The first magnetic disk device 3 includes a storage section 6 that stores data, etc., and a cache memory 5 that temporarily stores part of the data in the storage section 6 when accessed from the magnetic disk processing device 1. A magnetic disk interface control circuit 4 that controls a magnetic disk interface 2 with a magnetic disk processing device 1, a first magnetic disk device 3 and a second magnetic disk device 3;
A copy interface control circuit 8 that controls a copy interface 9 connected to the magnetic disk device 10 of
and an operation panel 7 for inputting commands by the operator.
It has

Similarly to the first magnetic disk 3, the second magnetic disk device 10 also has an operation panel 11. Copy interface control circuit 12. Magnetic disk interface control circuit 13. Cache memory 14. It has a storage section 15.

First magnetic disk device 3 and second magnetic disk device 1
0 has a dual-write configuration, and when writing data from a host device, data is written to both the first magnetic disk device 3 and the second magnetic disk device 10 via the magnetic disk processing device 1. is written, and in read processing, data read from the first magnetic disk device 3 is sent to the host device via the magnetic disk processing device W1.

By doing this, the first magnetic disk device 3
and the second magnetic disk device 10 store the same data. If a failure occurs in the second magnetic disk device 10, only the second magnetic disk device 10 is placed offline with the magnetic disk processing device 1, and the magnetic disk processing device 1 can only access the first magnetic disk 3. shall be.

At the time of failure recovery, the second magnetic disk device 10 is brought online and the copy interface control circuit 12 is started up from the operation panel 11, so that the cache memory 5. Copy interface control port F! @8° The data in the storage unit 6 is sent to the second magnetic disk device 10 via the copy interface 9, and sent to the copy interface control circuit 12. of the second magnetic disk device 210. It is stored in the storage unit 15 via the cache memory 14. By copying from the first magnetic disk device 3 to the second magnetic disk device 10 at regular time intervals, access is possible even during copying.

〔Effect of the invention〕

As explained above, the present invention provides a dual-write configuration for the magnetic disk subsystem, connects magnetic disk devices with a copy interface, and performs copying without the intervention of a magnetic disk processing device, thereby making it possible to repair failures, etc. This has the effect that data can be used without any change and data will not be lost.

4.13...Magnetic disk interface control circuit,
5.14... Cache memory, 6.15... Storage unit, 7.11... Operation panel, 8.12... Copy interface control circuit, 9... Copy interface, 10... No. 2 magnetic disk device.

Claims (1)

[Scope of Claim] A magnetic disk subsystem including a magnetic disk processing device, a first magnetic disk device that stores main data, and a second magnetic disk device that is used as a copy of the main data, comprising: a magnetic disk interface that connects a magnetic disk processing device, the first magnetic disk device, and the second magnetic disk device; and a copy interface that connects the first magnetic disk device and the second magnetic disk device. The first and second magnetic disk devices each include a storage section that stores data, and a cache memory that temporarily stores part of the data in the storage section when accessed by the magnetic disk processing device. and a magnetic disk interface control circuit for controlling an interface with the magnetic disk processing device, a copy interface control circuit for controlling a copy interface with the magnetic disk, and an operation panel for inputting commands by an operator. A magnetic disk subsystem featuring: