JPH02213964A - Memory copying method - Google Patents

Abstract

PURPOSE:To prevent the service deterioration of a working system by storing the update data due to the operation service of the working system produced in a copying mode into a temporary store buffer of a spare system and updating the memory of the spare system to secure the coincidence of memory contents between the working and spare systems. CONSTITUTION:The entire areas of variable data to be coincident with each other are copied en bloc to a memory 3b of a spare system 1b from a memory 3a of a working system 1a via a copying mechanism 4. Then the update data due to the operation service of the system 1a produced in a copying mode is stored in a temporary store buffer 7 via a temporary store mechanism 5. The update data is taken out of the buffer 7 after the copy is through and stored in the memory 3 via a memory update mechanism 6 which updates the memory 3 based on the update data stored in the buffer 7. Thus it is possible to secure the coincidence of contents between both memories 3a and 3b without stopping the present operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory copying method for duplexed memory in an online system having a duplex configuration. As described in the above publication, during memory copying, the operations of both processors are stopped and memory copying is performed by a dedicated copying circuit.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the suspension time of the operational service due to an increase in the amount of copies, and has the problem of deteriorating the serviceability.The purpose of the present invention is to stop the operational service. active system/in operation state.
To provide a memory copy method that performs backup memory-to-memory copy and guarantees data identity and currency.

[Means to solve the problem]

The above purpose is to copy all the variable data that should be matched from the active system to the backup system all at once in a duplex system in which the processor and memory have a duplex configuration and match the memory contents of the active system and the backup system. Memory copying that occurs in the temporary storage buffer of the active system, and updates the memory of the backup system with the update data accumulated in the buffer after the above copy is completed, so that the memory contents of the active system and the backup system match. @[Operation] Achieved by the method The above memory copy method performs batch copying of the entire variable data to be made consistent from the current memory to the backup memory, and also includes The updated data accompanying the operational service of the active system that occurs is accumulated in the temporary storage buffer of the standby system, and after the copying is completed, the update data accumulated in the buffer is used to store the memory of the standby system. (by updating means), the updated data is taken out from the buffer and stored in the memory of the standby system, thereby matching the memory contents of the active system and the standby system in the operational state without stopping the operation. becomes possible.

〔Example〕

An embodiment of the present invention will be explained below with reference to FIGS. 1 and 2.

FIG. 1 is a system configuration diagram of a duplex configuration of an active system and a backup system showing an embodiment of the memory copy method according to the present invention. In FIG. 2a and 2b are processors, and S& and Sk are memory devices. 4, 5.6 is a mechanism for implementing the present memory copy method, and 4.
Reference numeral 5 denotes a copy mechanism that serves as a means for batch copying all variable data to be made consistent from the memory device 3a of the active system 1a to the memory device 3b of the backup system 1b; A temporary storage mechanism 6 serves as a means for storing update data 9b accompanying the operation service IOK in a temporary storage buffer 7, and a temporary storage mechanism 6 serves as a means for storing update data 9d stored in the time storage pad 7a 7 after the copying mechanism 4 finishes copying. Reference numeral 08 denotes a copy mechanism 4, which is a memory update mechanism that serves as a means for updating the memory device 3b of the backup system 1b.
The copy data (flow) 9a to 9e are the update data (flow) accompanying the operation service IOK.

FIG. 2 is an explanatory diagram of 7 lags during execution of the memory-to-memory copy in FIG. 1. In FIG. 2, 11 is 7 lags while the memory-to-memory copy is being executed in the active system 1a, and 12 is 7 lags while the memory-to-memory copy is being executed in the backup system 1b. Next, the present memory copy method will be explained by taking as an example the memory copy operation of the entire variable data area that is required when the backup system 1b in FIG. 1 moves from the stopped state to the standby state.
The copy mechanism 4 sets 7 lags 11 of the active system 1a shown in FIG.
During memory-to-memory copying, the entire area of the variable data 8 is copied in bulk from the memory device 3a to the memory device 5b of the standby system 1b using the self-copy mechanism 4. ! *; After the copy is completed, the copy mechanism 4 of the active system 1a sets the memory-to-memory copy in progress 7 lag 11 of the active system 1a to non-executing, and sets the self-copy mechanism to the memory-to-memory copy in progress 7 lag 12 of the standby system 1b. 4 to copy.

During the copying of the variable data 8, the update data generated by the operation service 10 of the active system 1a is stored as update data 9a in the memory device 5aK of the active system 1a, and at the same time, the - The data is transferred to the time accumulation mechanism 5 as update data 9b. When this happens, the storage mechanism 5 stores the received update data in the temporary storage buffer 7 as update data 9C.
Out) Method O Inner Tools - Managed by control. In addition, the memory update mechanism 6 monitors the lag 12 during memory-to-memory copying of the backup system 1b, and does not retrieve update data from the temporary storage buffer 7 if the memory-to-memory copy is in progress. At the point when the execution 7 lag 12 changes to non-execution (copy completed), the update data 9d that has been suspended due to the copy execution of the copy mechanism 4 is started to be retrieved from the time accumulation buffer 7, and the update data 9d is transferred to the memory. Update device 5b with data 9eK
As a result, the contents of the memory devices 5a and 5b of both systems 1a and lb match, and the standby system 1b enters the standby state.

After the backup system 1) has transitioned to the standby state, the active system 1)
The update data 9a generated with the operation service 10 of a is transferred through the same route as the copy data 8 of the copy mechanism 4 and updates the memory device 5b of the backup system 1t, but the memory update in this process is Since the copy mechanism 4 is not being executed, the mechanism 5 sequentially retrieves the update data 9d accumulated in the temporary accumulation buffer 7 and updates the memory device 5b, so the memory device 5a of both systems 1a and lb is , 5b always have matching contents.

According to Minomoto, since the copy mechanism 4 can be executed without stopping the operation service 10, it is possible to prevent the serviceability of the active system 1a from deteriorating. [Effects of the Invention] According to the present invention, It is possible to copy between memories without stopping the active service, which has the effect of preventing a decline in the active service.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a redundant configuration of an active system and a backup system, showing an embodiment of the memory copy method according to the present invention;
The figure is an explanatory diagram of the inter-memory copying flag in FIG. 1. la, lb...active system, standby system (maintenance and operation section of exchange), 2a, 2b...processor, 5a, 5b...memory device, 4...copy mechanism, 5...-time storage mechanism, 6... memory update mechanism, 7...-time accumulation buffer, 8... copy data (flow), 9&~9e... update data (flow), 10... operation service, 11.・
・Between active memory; 7 lags in progress, 12... Flag in progress of copying between spare memory.

Claims (1)

[Claims] 1. In a duplex system in which the processor and memory have a duplex configuration and the memory contents of the active system and the backup system are made to match, the entire range of variable data to be matched is copied from the active system to the backup system in a batch, and the problem that occurs during the copying is The updated data associated with the operation service of the active system is accumulated in the temporary storage buffer of the backup system, and after the above copy is completed, the memory of the backup system is updated with the update data accumulated in the buffer, and the memory contents of the active system and the backup system are updated. A memory copy method characterized by matching.