Help Center/ Data Replication Service/ Real-Time Disaster Recovery/ DR Overview
Updated on 2022-09-21 GMT+08:00
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DR Overview

To prevent service unavailability caused by regional faults, DRS provides disaster recovery to ensure service continuity. You can easily implement disaster recovery between on-premises and cloud, without the need to invest a lot in infrastructure in advance.

The disaster recovery architectures, such as two-site three-data-center and two-site four-data center, are supported. A primary/standby switchover can be implemented by promoting a standby node or demoting a primary node in the disaster recovery scenario.

Figure 1 Real-time DR switchover

Supported Database Types

Table 1 lists the database types supported by DRS.

Table 1 DR schemes

Service Database

DR Database

Documentation
  • On-premises MySQL databases
  • MySQL databases on an ECS
  • MySQL databases on other clouds
  • RDS for MySQL

RDS for MySQL

GaussDB(for MySQL) primary/standby

DDM

DDM

GaussDB(for MySQL) primary/standby

GaussDB(for MySQL) primary/standby

Principles of Real-Time Disaster Recovery

DRS uses the real-time replication technology to implement disaster recovery for two databases. The underlying technical principles are the same as those of real-time migration. The difference is that real-time DR supports forward synchronization and backward synchronization. In addition, disaster recovery is performed on the instance-level, which means that databases and tables cannot be selected.