Provisioned IOPS – Provisioned IOPS storage is designed to meet the needs of I/O-intensive workloads, particularly database workloads, that are sensitive to storage performance and consistency in random access I/O throughput. Provisioned IOPS volumes can range in size from 100 GB to 6 TB for MySQL, MariaDB, PostgreSQL, and Oracle DB engines. SQL Server Express and Web editions can range in size from 100 GB to 4 TB, while SQL Server Standard and Enterprise editions can range in size from 200 GB to 4 TB. You specify the amount of storage you want allocated, and then specify the amount of dedicated IOPS you want. These two values form a ratio, and this value maintains the ratio specified for the DB engine you chose. Amazon RDS delivers within 10 percent of the provisioned IOPS performance 99.9 percent of the time over a given year.