Storage capacity units (SCUs) are subscription storage resource plans that can be used to offset the pay-as-you-go bills of various Alibaba Cloud storage services.
Offset rules
SCUs can be used to offset the storage fees of multiple Alibaba Cloud storage services. The following table describes the rules when you use SCUs to offset the storage fees of different storage classes of Object Storage Service (OSS) resources in regions in the Chinese mainland.
For more information about the rules for other Alibaba Cloud storage services and regions, see Pricing.
Storage class | Offset factor | Description |
Standard LRS | 0.06 | Every 0.06 GB of SCU capacity can be used to offset the storage fees for 1 GB of Standard locally redundant storage (LRS) objects. |
Standard ZRS | 0.06 | Every 0.06 GB of SCU capacity can be used to offset the storage fees for 1 GB of Standard zone-redundant storage (ZRS) objects. |
IA LRS | 0.04 | Every 0.04 GB of SCU capacity can be used to offset the storage fees for 1 GB of Infrequent Access (IA) LRS objects. |
IA ZRS | 0.05 | Every 0.05 GB of SCU capacity can be used to offset the storage fees for 1 GB of IA ZRS objects. |
Archive LRS | 0.01 | Every 0.01 GB of SCU capacity can be used to offset the storage fees for 1 GB of Archive LRS objects. |
Offset order
Storage plans and SCUs are used to offset the storage fees of OSS resources in the following order: storage plans for specific regions > storage plans for all regions in the Chinese mainland> SCUs > pay-as-you-go billing method.
Examples
User A purchased a Standard LRS storage plan with a capacity of 500 GB and 20 GB of SCUs for the China (Hangzhou) region in June 2021. User A stored 600 GB of Standard LRS objects and 200 GB of Archive LRS objects in the China (Hangzhou) region in June 2021. The following table describes how the storage fees of User A in June 2021 are offset.
Storage class | Offset by storage plan | Offset by SCUs |
Standard LRS | The storage fees for 500 GB of Standard LRS objects are offset by the Standard LRS storage plan of 500 GB. | The storage fees for the remaining 100 GB of Standard LRS objects are offset by 6 GB of SCUs. (600 GB - 500 GB) × 0.06 = 6 GB. |
Archive LRS | None | The storage fees for 200 GB of Archive LRS objects are offset by 2 GB of SCUs. 200 GB × 0.01 = 2 GB. |