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Last updated：2021-08-12 09:51:22
KS3 provides three storage classes to meet different requirements for data access frequency and cost.
Standard: Standard storage provides a general object storage service, which is applicable to hotspot data that is frequently accessed or data that requires low latency and high throughput, such as audio, video, and image files, and static website resources.
Infrequent Access (IA): IA storage is applicable to infrequent access scenarios, where data is stored for a long time and seldom accessed. This storage class reduces storage fees. At the same time, it keeps access latency within milliseconds. When you retrieve data, you can obtain data immediately without the need to wait. However, this storage class places a limit on the storage duration. If you delete objects that are stored for less than 30 days, some fees may occur. In addition, data retrieval also incurs fees, regardless of whether you retrieve the data over the internal network or the Internet.
Archive: Archive storage is applicable to extremely infrequent access scenarios, where data is stored for a long time and rarely accessed. This storage class provides the same data reliability and service availability as Standard storage and IA storage with a much lower price. However, it takes 1 to 10 minutes to restore data to the readable state. You can use Archive storage to store data that requires long-term storage, such as medical images, archives, business logs, and stock footages. Archive storage also places a limit on the storage duration. If you delete objects that are stored for less than 90 days, some fees may occur. In addition, reading data from archive storage also incurs data retrieval fees.
| Item | Standard | IA | Archive |
|---|---|---|---|
| Data reliability | 99.999999999% | 99.999999999% | 99.999999999% |
| Access availability | 99.95% | 99.9% | 99% (after data is restored) |
| Shortest storage duration | Unlimited | 30 days | 90 days |
| Access latency | Real-time access with millisecond-level latency | Real-time access with millisecond-level latency | 1-10 minutes for restoration before data can be accessed |
| Image processing | Supported | Supported | Supported after restoration |
| Applicable scenarios | Origin servers for audio and video distribution, image sharing, large-scale websites, and mobile applications | Backups of enterprise applications and databases, data recorded by surveillance cameras, and stock footages | Medical images, archives, business logs, and stock footages |
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