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

last updated: 2024-12-10 15:13 UTC - commit: 2c64ecb7073ffa3430dbc84382023c5bce974b6a