Amazon Relational Database Service (Amazon RDS) DB instances use current file systems and the latest io2 Block Express volumes to deliver high performance and scalability. In contrast, RDS instances running on legacy file systems face several limitations. Storage is capped at 16 TiB, and some engines, including MySQL, MariaDB, and PostgreSQL, may encounter per-file size limits of approximately 2 TiB due to file system constraints, even though the database engines themselves support larger objects. Legacy file systems may also perform writes less efficiently, which can reduce overall database throughput.
RDS instances using previous-generation io1 storage face similar storage limits and provide lower IOPS and throughput compared with io2 Block Express volumes. Upgrading to the current file system removes these limitations without additional charges for the file system itself. Storage can expand up to 64 TiB, and write performance is improved.
Storage choice…
