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Amazon Aurora automatically maintains six copies of your data across three Availability Zones (AZs), and will automatically attempt to recover your database in a healthy AZ with no data loss. This makes it fault-tolerant and self-healing. It transparently handles the loss of up to two copies of data without affecting database write availability, and up to three copies without affecting read availability. Data blocks and disks are continuously scanned for errors and replaced automatically. Unplanned failover takes place within minutes and is almost immediate and automatic because all replicas use the same logging and storage layers. Amazon RDS failover to a replica takes comparatively more time and has to be done manually.
Amazon Aurora can detect a database failure and recover in less than a minute, without the need to warm up the database caches that are needed for better response times. In the case of a permanent failure, Aurora can automatically failover to a replica without losing any data.
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