RDS

  Multi-AZ DB instance deployment. - one standby instance , but doesn’t serve reads. The primary DB instance is synchronously replicated across Availability Zones to a standby replica. can have increased write and commit latency compared to a Single-AZ deployment. This can happen because of the synchronous data replication that occurs. You might have a change in latency if your deployment fails over to the standby replica, although AWS is engineered with low-latency network connectivity between Availability Zones. For production workloads, we recommend that you use Provisioned IOPS (input/output operations per second) for fast, consistent performance


Multi-AZ DB cluster deployment. - multiple standby instance , serve reads

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