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Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com>
Co-authored-by: wangdengke2 <wangdengke2@huawei.com>
Co-committed-by: wangdengke2 <wangdengke2@huawei.com>
2026-04-23 10:06:18 +00:00

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Changing a Storage Type

Scenarios

If the storage type of your RDS DB instance does not match your workloads, you can change it as needed.

For details about storage types, see DB Instance Storage Types.

Constraints

Table 1 Constraints

Phase

Constraints

Before the change
  • The storage type of an instance can be changed only when the instance is in the Available state.
  • Changing the storage type may affect storage performance, so the storage type should be changed during off-peak hours.
  • If the storage type of a read replica is different from that of its associated DB instance, the data synchronization may be affected. Ensure that the storage type of the read replica is the same as or faster than that of the primary DB instance.

During the change

Changing a storage type takes several minutes or even hours, depending on the throughput, storage space, original storage type, and new storage type.

After the change

In rare cases, a storage type may fail to be changed due to a backend issue. If this happens, try again later.
Table 2 Storage types that can be changed

Instance Type

Original Storage Type

Target Storage Type

Single

Cloud SSD

Flexible SSD

Flexible SSD

Cloud SSD

Read Replica

Cloud SSD

Extreme SSD or Flexible SSD

Extreme SSD

Cloud SSD or Flexible SSD

Flexible SSD

Cloud SSD or Extreme SSD

Primary/Standby

Cloud SSD

Extreme SSD or Flexible SSD

Extreme SSD

Cloud SSD or Flexible SSD

Flexible SSD

Cloud SSD or Extreme SSD

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click Service List. Under Database, click Relational Database Service. The RDS console is displayed.
  4. On the Instances page, locate a DB instance using cloud SSD and choose More > Change Instance Class in the Operation column.

    Alternatively, click the instance name to go to the Summary page. Under Instance Class, click Configure.

  5. On the Change Instance Class page, select a new storage type and click Next.

    If you select Flexible SSD, select Instance Specifications or Disk QoS for Change Type as needed.

    • To change instance specifications, click Instance Specifications under Change Type and select the new specifications.
    • To change disk QoS, click Disk QoS under Change Type and enter the new IOPS and throughput.
      • IOPS: The value range is from 3000 to 128000. The IOPS is limited by the disk size and must be no greater than 500 times the disk capacity.
      • Throughput: The value range is from 125 to 1000 (in MiB/s) and must also be no greater than the IOPS divided by 4.

  6. Confirm the configurations and Click Submit.
  7. Check the results.

    Return to the Instances page. A few minutes later, click the instance name and check the new storage type on the displayed Summary page.

Parent topic: Instance Modifications