Data transmission method of network disaster-tolerant system

Abstract

The invention relates to a data transmission method of a network disaster-tolerant system. The system comprises a master node and at least one spare node; meta data information is stored in each node; the meta data information comprises information of the master node related to output transmission of the node in the last time and information of data written in the previous time; and the method comprises the following steps that: S1, the spare node and the master node are connected to shake hands and exchange respective meta data information; and S2, the master node compares the self meta data information with the meta data information of the spare node and determines one of four replication modes so as to realize data transmission. According to the invention, which mode is adopted is automatically judged while shaking hands again; the time required by disaster-tolerant recovery is shortened; furthermore, if the master node writes in data while incremental synchronization is carried out, a data incremental bitmap is not updated immediately; but, after incremental replication in this round is finished, incremental synchronization is carried out again after data between a head pointer of the spare node and a head pointer of the master node is converted into the data incremental bitmap; and therefore, the data integrity of the spare node is ensured.

Description

technical field [0001] The invention relates to the technical field of data disaster recovery, in particular to a data transmission method of a network disaster recovery system. Background technique [0002] With the development of Internet applications, the number of Internet users is getting wider and wider, and a large amount of user data is stored on Internet servers, all of which put forward stricter requirements for the availability of applications running on the Internet and the reliability of data storage. requirements, because an application failure may cause immeasurable losses, and data loss will have fatal consequences. [0003] For example, on the morning of April 21, 2011, Amazon's EC2 and RDS services experienced network delays and connection errors, resulting in intermittent inaccessibility to websites such as Foursquare, Quora, and RedditPaper.li. There are many large-scale websites placed on EC2. Some foreign media said that half of the US Internet was aff...

AI Technical Summary

Problems solved by technology

In the prior art, when re-shaking hands between nodes, especially in the case of unplanned migration, the full-disk copy mode is generally adopted, which undoubtedly increases the service duration of the master node and increases the communication between the master and backup nodes. The amount of data transmission greatly prolongs the time required for application recovery and increases the time for incomplete backup machine data, because incomplete backup machine data is likely to cause the risk of unavailable disaster recovery data

[0012] In addition, the following defects also exist in the prior art: during incremental replication (incremental replication is implemented based on bitmap), if the host receives external newly written data every time, it will immediately generate a new bitmap, which will As a result, the incremental synchronization has been carried out and the moment when the bitmap is 0 cannot be obtained, resulting in the incomplete state of the standby machine data

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