 <p>Missed Iops, This is working now</p> <pre><code>{ "AWSTemplateFormatVersion" : "2010-09-09", "Resources" : { "MyDB" : { "Type": "AWS::RDS::DBInstance", "Properties": { "DBInstanceClass" : "db.t2.medium", "AllocatedStorage" : "400", "MasterUsername" : "xxxxxxxxxxxx", "MasterUserPassword" : "xxxxxxxxxxxx", "DBSnapshotIdentifier" : "xxxxxxxxxxxx-2016-07-13-1700", "Iops":"2000", "StorageType":"io1" } } } } </code></pre>