Yes. DRS provides high availability and can migrate a single RDS instance or RDS primary/standby instances. DRS can automatically rebuild the databases connection after a short interruption and resumes data transfer from the point when the connection was lost to ensure the continuity and consistency of data synchronization.
If the HA design of the source database meets the requirements of floating IP address connections and RPO is 0 during a switchover, DRS supports migration of primary/standby instances without manual intervention.
If the HA design does not meet the requirements of floating IP address connections and RPO is 0 during a switchover, the following situations may occur:
- The floating IP address is used and RPO may be 0 during a switchover. In this situation, the database can be connected, but DRS will identify data interruption (if data loss occurs during the switchover) and display a message indicating that the task fails. You can only reset the migration task.
- A fixed IP address is used and RPO is 0 during the switchover. In this situation, the migration is supported only when the instance is running properly.
- The floating IP address is used and zero RPO cannot be ensured during a switchover. In this situation, the database can be connected, but DRS will identify data interruption (if data loss occurs during the switchover) and display a message indicating that the task fails. You can only reset the migration task.
If the destination is primary/standby instances, DRS can ensure that the source data is completely migrated to the destination database. However, the switchover of the destination database cannot ensure zero RPO. As a result, data in the destination database may be incomplete.