DB Instance Storage Types

The database system is generally an important part of an IT system and has high requirements on storage I/O performance. You can select a storage type based on service demands. You cannot change the storage type after the DB instance is created.

Description

RDS supports Local SSD (also called Ultra-high I/O) to suit different performance requirements of your workloads.

Cloud SSD/Ultra-high I/O: stores data in cloud disks for decoupled storage and compute. The maximum throughput is 350 MB/s.

For RDS for MariaDB instances, this storage type is normally displayed as Cloud SSD, but for existing instances in certain regions it is displayed as Ultra-high I/O.
The supported IOPS depends on the I/O performance of the Elastic Volume Service (EVS) disk. For details, see the description about ultra-high I/O in Disk Types and Performance of the Elastic Volume Service Service Overview.

Performance

**Table 1** Performance
Item	Cloud SSD
I/O performance	Subpar I/O performance due to additional network I/O overheads
Elastic scalability	Scaling in seconds
Maximum IOPS	50,000
Maximum throughput	350 MB/s
Read/write latency	1 ms