Does RDS Support Cross-AZ High Availability?
Yes. When you buy a DB instance, you can select Primary/Standby for DB Instance Type and then select different AZs for Primary AZ and Standby AZ.
RDS does not support 3-AZ deployment.
An AZ is a physical region where resources have independent power supplies and networks. AZs are physically isolated but interconnected through an internal network. You can deploy your instance across AZs in some regions.
To achieve higher reliability, if you deploy the primary and standby instances in the same AZ, RDS will automatically deploy the primary and standby instances in different physical servers. If you attempt to deploy your primary and standby instances in the same AZ in a Dedicated Computing Cluster (DCC) and there is only one physical server available, the creation will fail.
RDS allows you to deploy primary/standby DB instances in an AZ or across AZs. You can determine whether the standby AZ is the same as the primary AZ.
- If they are different (default setting), the primary and standby instances are deployed in different AZs to ensure failover support and high availability.
- If they are the same, the primary and standby instances are deployed in the same AZ. If an AZ failure occurs, high availability cannot be ensured.
Product Consulting FAQs
- What Should I Pay Attention to When Using RDS?
- What Is the Availability of RDS DB Instances?
- How Do I Distinguish Between General-Purpose and Dedicated RDS for MySQL Instances Using Cloud SSDs?
- Will My RDS DB Instances Be Affected by Other User Instances?
- Does RDS Support Cross-AZ High Availability?
- Can RDS Primary/Standby DB Instances Be Changed to Single DB Instances?
- What Can I Do About Slow Responses of Websites When They Use RDS?
- Can I Change the Replication Mode Between Primary DB Instances and Read Replicas?
- What Is the Time Delay for Primary/Standby Replication?
- Can Multiple ECSs Connect to the Same RDS DB Instance?
- Can I Encrypt the Disk After Purchasing an RDS DB Instance?
- Will Backups Be Encrypted After Disk Encryption Is Enabled for My RDS Instance?
- Does RDS for MySQL Support Encryption Functions?
- What Are the Restrictions on RDS for MySQL DB Instances After GTID Is Enabled?
- Will Different RDS DB Instances Share CPU and Memory Resources?
- How Many Databases Can Run on an RDS DB Instance?
- Is RDS for MySQL Compatible with MariaDB?
- Does RDS for MySQL Support TokuDB?
- What Is the Maximum Size Allowed for a Single Table in RDS for MySQL Instances?
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