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DB Instance Storage Types

Updated on 2024-12-20 GMT+08:00

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 Cloud SSD (also called Ultra-high I/O) and Extreme SSD to suit different performance requirements of your workloads.

  • Cloud SSD or Ultra-high I/O

    Stores data in cloud disks for decoupled storage and compute. The maximum throughput is 350 MB/s.

    • For RDS for MySQL 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.
    • For RDS for MariaDB, RDS for PostgreSQL and RDS for SQL Server instances, this storage type is displayed as Cloud SSD.
    • The supported IOPS depends on the I/O performance of the Elastic Volume Service (EVS) disk. For details, see "Ultra-high I/O" in Disk Types and Performance of the Elastic Volume Service Service Overview.
  • Extreme SSD

    Uses 25GE network and RDMA technologies to provide you with up to 1,000 MB/s throughput per disk and sub-millisecond latency.

    • Only RDS for MySQL, RDS for SQL Server, and RDS for PostgreSQL support extreme SSDs.
    • The supported IOPS depends on the I/O performance of the EVS disk. For details, see "Extreme SSD" in Disk Types and Performance of the Elastic Volume Service Service Overview.
  • Extreme SSD V2

    Extreme SSD V2: supports super-high IOPS and throughput as well as super-low latency for the most performance-demanding workloads.

    With the Extreme SSD V2 type, you can buy disks with the IOPS tailored to your workloads. The disk performance no longer changes with the disk capacity.

    NOTE:

    Extreme SSD V2 is now available only in CN South-Guangzhou. To use this storage type, contact customer service.

    Extreme SSD V2 disks with a preconfigured IOPS higher than 128,000 can only reach the maximum performance on AC7 compute resources. To use such disks, contact customer service.

    • Only RDS for SQL Server supports extreme SSD V2 disks.
    • The supported IOPS depends on the I/O performance of the EVS disk. For details, see "Extreme SSD" in Disk Types and Performance of the Elastic Volume Service Service Overview.

Performance Comparison

Table 1 Performance comparison

Item

Cloud SSD

Extreme SSD

Extreme SSD V2

I/O performance

Sub-par I/O performance due to additional network I/O overheads

Higher I/O performance than cloud SSDs

Higher I/O performance than cloud SSDs

Elastic scalability

Scaling in seconds

Scaling in seconds

Scaling in minutes

Maximum IOPS

50,000

128,000

Smaller value: min(256000, Storage space x 1000)

You can buy disks with the IOPS tailored to your workloads. IOPS is separately billed on a pay-per-use basis.

Maximum throughput

350 MB/s

1,000 MB/s

4,000 MB/s

Read/write latency

1 ms

Sub-millisecond

Sub-millisecond

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