Storage capacity units (SCUs) are subscription storage resource plans that can be used to offset the pay-as-you-go bills of various storage resources. Compared with disks purchased together with subscription Elastic Compute Service (ECS) instances or resource plans of a specific resource, SCUs offer a better combination of cost-effectiveness and flexibility together with pay-as-you-go resources.
For more information, see Snapshot billing.
Offset factors
SCUs offset storage fees for multiple cloud products. The following table lists the offset factors for snapshot capacity in the Chinese mainland.
For more information about the pricing rules for other regions and cloud products, see Pricing or .
|
Type |
SCU capacity coefficient per GiB of storage |
Description |
|
Standard snapshot |
0.12 |
0.12 GiB of SCU capacity offsets 1 GiB of snapshot storage. |
Offset order
Snapshot storage fees are based on snapshot size and storage duration. The default billing method is pay-as-you-go. You can use OSS Standard locally redundant storage plans, an SCU, or reserved capacity to offset fees. Billing starts when a snapshot is created and ends when the snapshot is released.
In a single region, you can purchase either OSS Standard locally redundant storage plans or reserved capacity. Snapshot storage fees are offset in one of the following ways:
-
OSS Standard locally redundant storage plan > SCU > Pay-as-you-go
-
Reserved capacity > SCU > Pay-as-you-go
Offset example
A customer has 500 GiB of snapshot storage in January 2022 and has purchased a 200 GiB OSS Standard locally redundant storage plan and a 40 GiB SCU. The monthly offset is calculated as follows:
|
Type |
OSS storage plan offset |
SCU offset |
|
Snapshot |
The 200 GiB OSS Standard locally redundant storage plan offsets 200 GiB of snapshot storage fees. |
36 GiB of the SCU offsets the remaining 300 GiB of snapshot storage fees. SCU capacity consumed for the remaining 300 GiB after the OSS Standard locally redundant storage plan offset: (500 GiB - 200 GiB) × 0.12 = 36 GiB |