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Wang , Deng Ke 5523220f09 DRS UMN 20221102 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com>
Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
2022-12-08 10:16:13 +00:00

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Real-Time Disaster Recovery

Database Types

DRS supports disaster recovery (DR) management for the following types of databases.

Table 1 Database types

DR Direction

Data Flow

Service Database

DR Database

DR DB Instance Type

Current cloud as standby

MySQL->MySQL
  • On-premises databases
  • Databases on an ECS
  • Databases on other clouds
  • RDS MySQL instances

RDS MySQL instances
  • Single DB instance
  • Primary/Standby DB instance

Current cloud as active

MySQL->MySQL

RDS MySQL instances
  • On-premises databases
  • ECS databases
  • Databases on other clouds
  • RDS MySQL instances
  • Single DB instance
  • Primary/Standby DB instance

Current cloud as standby

MySQL -> GaussDB(for MySQL) primary/standby
  • On-premises databases
  • ECS databases
  • Databases on other clouds
  • RDS MySQL instances

GaussDB(for MySQL) primary/standby instances
  • Primary/Standby instance

Current cloud as standby

Cassandra->Cassandra
  • On-premises databases
  • ECS databases
  • Databases on other clouds
  • GaussDB(for Cassandra) instances

GaussDB(for Cassandra) instances
  • Cluster

Current cloud as active

Cassandra->Cassandra
  • GaussDB(for Cassandra)
  • On-premises databases
  • ECS databases
  • Databases on other clouds
  • GaussDB(for Cassandra) instances
  • Cluster

Database Versions

Table 2 Database versions

DR Direction

Data Flow

Service Database Version

DR Database Version

Current cloud as standby

MySQL->MySQL
  • MySQL 5.6.x
  • MySQL 5.7.x
  • MySQL 8.0.x
  • MySQL 5.6.x
  • MySQL 5.7.x
  • MySQL 8.0.x

Current cloud as active

MySQL->MySQL
  • MySQL 5.6.x
  • MySQL 5.7.x
  • MySQL 8.0.x
  • MySQL 5.6.x
  • MySQL 5.7.x
  • MySQL 8.0.x

Current cloud as standby

MySQL -> GaussDB(for MySQL) primary/standby
  • MySQL 5.6.x
  • MySQL 5.7.x

GaussDB(for MySQL)-MySQL 8.0

Current cloud as standby

Cassandra-> Cassandra

Cassandra 2.x

GaussDB(for Cassandra) 3.x

Current cloud as active

Cassandra->Cassandra

GaussDB(for Cassandra) 3.x

Cassandra 2.x

Network Preparations

DRS supports disaster recovery through a Virtual Private Network (VPN), Direct Connect, or public network. Table 3 lists the application scenarios of each network type and required preparations.

Table 3 Network types

Network Type

Application Scenario

Preparations

VPN

Disaster recovery from on-premises databases to cloud databases or between cloud databases across regions

Establish a VPN connection between your local data center and the VPC that hosts the destination database. Before disaster recovery, ensure that the VPN network is accessible.

Direct Connect

Disaster recovery from on-premises databases to cloud databases or between cloud databases across regions

Use a dedicated network connection to connect your data center to VPCs.

Public network

Disaster recovery from on-premises databases or other cloud databases to destination databases.

To ensure network connectivity between the source and destination databases, perform the following operations:

  1. Enable public accessibility.

    Enable public accessibility for the source database based on your service requirements.

  2. Configure security group rules.
    • Add the EIPs of the disaster recovery instance to the whitelist of the source database for inbound traffic.
    • If destination databases and the DR instance are in the same VPC, they can communicate with each other by default. You do not need to configure a security group.
    NOTE:
    • The IP address on the Configure Source and Destination Databases page is the EIP of the DR instance.
    • If SSL is not enabled, backing up confidential data for disaster recovery is not recommended.
Table 4 Supported network types

DR Direction

Data Flow

VPC

Public Network

VPN or Direct Connect

Current cloud as standby

MySQL->MySQL

Not supported

Supported

Supported

Current cloud as active

MySQL->MySQL

Not supported

Supported

Supported

Current cloud as standby

MySQL -> GaussDB(for MySQL) primary/standby

Not supported

Supported

Supported

Current cloud as standby

Cassandra->Cassandra

Not supported

Supported

Supported

Current cloud as active

Cassandra->Cassandra

Not supported

Supported

Supported
Parent topic: Functions and Features