Asynchronous remote copy system and method for maintaining data consistency thereof

Abstract

The invention discloses an asynchronous remote copy system and a method for maintaining data consistency thereof. The asynchronous remote copy system comprises a local server and a remote backup server which are connected through a network, wherein the local server adds write-in requests of an application module to newly-built write-in request groups or built and opened write-in request groups through a local remote copy module, the number of the write-in request groups carried in the write-in requests are transmitted to the remote backup server, and the write-in requests are submitted to a disc; and the remote backup server places the received write-in requests into the unclosed write-in request groups in a write-in request queue through the local remote copy module. The asynchronous remote copy system and the method for maintaining data consistency can effectively recognize all latent write-in dependency relationships, solve the problem of data consistency protection lack caused by the write-in dependency relationships, and can reliably ensure the consistency of asynchronous remote copy data.

Description

technical field [0001] The invention relates to a remote asynchronous mirror replication technology in computer data storage, in particular to an asynchronous remote replication system and a method for maintaining data consistency. Background technique [0002] With the continuous popularization of computer applications, computer users' requirements for data security are also increasing. In order to avoid data loss caused by various natural disasters and man-made disasters that may cause great losses to users, a remote replication technology that synchronizes data to remote servers in real time has been developed. When an accident occurs, this technology can use the data backed up to the remote server to restore the data on the local server, thereby ensuring the physical security of the data. [0003] Remote replication techniques can be divided into two categories of methods: synchronous replication and asynchronous replication. Among them, for the data of the upper appli...

AI Technical Summary

Problems solved by technology

Because this method needs to add timestamp information to the write request transmitted to the remote backup server, on the one hand, it increases the consumption of network resources, and on the other hand, the remote replication software on the remote backup server must be executed in strict order of timestamps. Write requests, so that the execution order of write requests without write dependencies cannot be changed, so the operating system cache and disk cache mechanism cannot be used to improve performance

[0006] Therefore, it is necessary to provide an improved remote replication system and its method for maintaining data consistency, which can more effectively overcome the problem of broken write dependencies, so that the consistency of written data can be maintained

Images