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    <p>We also run several RDS instances, in addition to MySQL on some machines that we manage ourselves. I can't comment specifically, as I'm not an Amazon engineer, but several things I've learned that might explain what you're seeing:</p> <ul> <li><p>Although Amazon does not share the backend details 100%, we strongly suspect that they are using their EBS system to back RDS databases. </p></li> <li><p>This article helps explain EBS limitations and snapshot functionality <a href="http://blog.rightscale.com/2008/08/20/amazon-ebs-explained/" rel="noreferrer">http://blog.rightscale.com/2008/08/20/amazon-ebs-explained/</a> Again, while it's not explicit, it would make sense for Amazon to be using this infrastructure to provide RDS services.</p></li> <li><p>Typically, a MySQL backup, in contrast to a snapshot, involves using a tool like mysqldump to create a file of SQL statements that will then reproduce the database. The database does not need to be frozen to do this. With an EBS backend, the best practice is to freeze the database (pause all transactions) while you are snapshotting to avoid data corruption.</p></li> <li><p>The spikes you're seeing at the ends of the backup window. If replication is paused by Amazon during the snapshot of your replica, the replica would then need to "catch up" on transactions when the snapshot was complete. This would cause a latency spike.</p></li> <li><p>Replication across a multi-AZ deployment is inherently slower then a single AZ deployment. The price you pay for better redundancy.</p></li> </ul>
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    1. POHow does Amazon RDS backup/snapshot actually work?
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    1. COGreat answer, +1.
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    2. COI can confirm that Amazon RDS is using EBS as the backing store for its RDS databases. The Read Latency and Write Latency graphs in RDS Cloudwatch are effectively describing an EBS instance. Thank you for this answer, it makes sense.
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    3. COAmazon shares more details in their outage post mortem here http://aws.amazon.com/message/65648/
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