JPH0484245A - Duplex storage device - Google Patents

Abstract

PURPOSE:To ensure the continuity of an access processing especially when a memory fault occurs by logically dividing one memory circuit into two, controlling them and succeeding the access processing with the other storing the same content as an object when one is in a fault state. CONSTITUTION:A memory logical duplex control part 1 logically divides one mounting memory 2 being the object of this invention into two virtual mounting memories 5 and 6 so as to control them. A processing program 4 accesses to the memories via a memory control part 3. The memory control part 3 receiving a memory access request gives the request of memory access to the memory logical duplex control part 1. The duplex control part 1 receiving the access request for the memories simultaneously accesses to the virtual mounting memories 5 and 6 which are obtained by logically dividing the mounting memory 2 into halves and it controls the contents of the virtual mounting memories 5 and 6 to be always the same. When the memory fault occurs in the mounting memory 2, the duplex control part 1 logically separates only the virtual memory where the memory fault occurs and continues the access processing for the memory only by the remaining virtual mounting memory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is utilized as a management means for a duplex memory device. In particular, the present invention relates to memory management means for ensuring continuity of access processing when a memory failure occurs.

〔overview〕

The present invention is a storage device in which one of two storage areas is controlled, and by realizing these two storage areas on one memory device, the cost of the device can be reduced. It is.

[Conventional technology]

Conventionally, when ensuring the continuity of access processing when a memory failure occurs, two memories are mounted instead of one and controlled.

[Problem to be solved by the invention]

In such a conventional example, two memories are mounted, so when a memory fault occurs, the control device for accessing the two mounted memories at the same time is physically separated from the faulty memory, and one of the mounted memories is This method requires a control device to continue the process by itself, which has the disadvantage of high cost.

The present invention aims to eliminate such drawbacks and to provide a duplex storage device with a simple configuration.

[Means to solve the problem]

The present invention provides two storage areas in which the same content is stored;
In a duplex storage device equipped with a control means including a means for selecting one of the storage areas to be controlled from the two storage areas, the vF feature indicates that one implemented memory circuit having the above two storage areas is provided. shall be.

Here, it is desirable that the control means include means for simultaneously accessing the two storage areas and separating the faulty storage area from the access target.

Further, it is desirable that the control means includes means for simultaneously accessing the two storage areas and making the storage area in which no failure has occurred an access target.

[Effect]

One memory circuit is logically divided into two parts and controlled, and when one memory circuit is in a faulty state, access processing is continued for the other part that stores the same content.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of this embodiment.

As shown in FIG. 1, this embodiment has two storage areas in which the same content is stored, and a control means including means for selecting one of the storage areas to be controlled from the two storage areas. Further, as a feature of the present invention, there is provided a mounted memory 2 which is one mounted memory circuit having the above-mentioned two storage areas, the above-mentioned control means is a memory logical duplication control section 1, and the above-mentioned 2. The two storage areas are virtual implementation memories 5 and 6, and there is a means for simultaneously accessing these two storage areas and separating the faulty storage area from the access target. It includes means for making an unoccupied storage area an access target.

Next, the operation of this embodiment will be explained. The memory logical duplication control unit 1 has one implemented memory 2 which is the object of the present invention.
is logically divided into two virtual memories 5 and 6 and controlled. The processing program 4 accesses the memory via the memory management section 3. The memory management unit 3 that has received the memory access request further issues a memory access request to the memory logical duplication control unit 1. The memory logical duplication control unit 1 that has received the memory access request creates a virtual mounted memory 5 that logically divides the mounted memory 2 into halves.
and the virtual mounting memory 6 at the same time, and control is performed so that the contents of the virtual mounting memory 5 and the virtual mounting memory 6 are always the same. When a memory failure occurs in the mounted memory 2, as shown in FIG. Continues memory access processing only.

〔Effect of the invention〕

As explained above, the present invention enables one mounted memory to be used for two
By dividing the memory into two virtual implementation memories and controlling the contents so that they are always the same, it is possible to continue processing even when a memory failure occurs.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the embodiment of the present invention. ■... Memory logical duplication control unit, 2... Mounted memory, 3... Memory management unit, 4... Processing program,
5.6...Virtual implementation memory.

Claims (1)

[Claims] 1. A duplex storage device comprising two storage areas in which the same content is stored, and a control means including means for selecting one of the storage areas to be controlled from the two storage areas. A duplex storage device comprising one mounted memory circuit having the above two storage areas. 2. The duplex storage device according to claim 1, wherein the control means includes means for simultaneously accessing the two storage areas and separating the faulty storage area from the access target. 3. The duplex storage device according to claim 2, wherein said control means includes means for simultaneously accessing said two storage areas and selecting a storage area in which no fault has occurred as an access target.