What are the storage classes provided by OSS? - Object Storage Service

Object Storage Service (OSS) provides the following storage classes for various data storage scenarios from hot data storage to cold data storage: Standard, Infrequent Access (IA), Archive, Cold Archive, and Deep Cold Archive.

Note

For more information about the pricing for each storage class, visit the OSS pricing page. For more information about the billing method for each storage class, see Storage fees.

Standard

Standard provides highly reliable, highly available, and high-performance object storage for data that is frequently accessed. Standard is suitable for various business applications, such as social networking applications, image, audio, and video resource sharing applications, large websites, and big data analytics. Standard supports the following data redundancy mechanisms:

Standard (LRS)
LRS stores multiple copies of your data on multiple devices of different facilities in the same zone. LRS provides data durability and availability even if hardware failures occur.
Important
LRS stores multiple data copies in a single zone. If the zone becomes unavailable, data in the zone is inaccessible. If your business application requires higher availability, we recommend that you use ZRS.
Standard (ZRS)
ZRS stores multiple copies of your data across multiple zones in the same region. Your data is still accessible even if a zone becomes unavailable.
Note
Standard zone-redundant storage (ZRS) is supported in the following regions: China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), China (Hong Kong), Japan (Tokyo), Singapore, Indonesia (Jakarta), and Germany (Frankfurt).

IA

IA provides highly durable storage at lower prices compared with Standard. IA has a minimum billable size of 64 KB and a minimum billable storage duration of 30 days. IA is suitable for data that is infrequently accessed, such as data accessed once or twice a month. You can access IA objects in real time. You are charged data retrieval fees when you access IA objects. IA supports the following data redundancy mechanisms:

Note

If the size of an IA object is smaller than 64 KB, you are charged for the minimum billable size. If an IA object is stored for less than the minimum billable storage duration of 30 days, you are charged for the storage usage of the IA objects that are stored for less than the minimum storage duration. For more information, see Storage fees.

IA (LRS)
LRS stores multiple copies of your data on multiple devices of different facilities in the same zone. LRS provides data durability and availability even if hardware failures occur.
Important
LRS stores multiple data copies in a single zone. If the zone becomes unavailable, data in the zone is inaccessible. If your business application requires higher availability, we recommend that you use ZRS.
IA (ZRS)
ZRS stores multiple copies of your data across multiple zones in the same region. Your data is still accessible even if a zone becomes unavailable.
Note
IA ZRS is supported in the following regions: China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), China (Hong Kong), Japan (Tokyo), Singapore, Indonesia (Jakarta), and Germany (Frankfurt).

Cold Archive

Cold Archive provides highly durable storage at lower prices compared with Archive. Cold Archive has a minimum billable size of 64 KB and a minimum billable storage duration of 180 days. You must restore a Cold Archive object before you can access it. The amount of time required to restore a Cold Archive object varies based on the object size and restoration priority. You are charged data retrieval fees and API operation calling fees when you restore Cold Archive objects. Cold Archive is suitable for cold data that needs to be stored for an extended period of time, including data that must be retained for an extended period of time to meet compliance requirements, raw data that is accumulated over an extended period of time in the big data and AI fields, retained media resources in the film and television industries, and archived videos in the online education industry.

Note

Cold Archive is supported in the following regions: China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Guangzhou), China (Chengdu), China (Hong Kong), US (Silicon Valley), US (Virginia), Japan (Tokyo), Singapore, Australia (Sydney) Closing Down, Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Germany (Frankfurt), UK (London), and UAE (Dubai).
If the size of a Cold Archive object is smaller than 64 KB, you are charged for the minimum billable size. If a Cold Archive object is stored for less than the minimum billable storage duration of 180 days, you are charged for the storage usage of the Deep Cold Archive object that is stored for less than the minimum storage duration. For more information, see Storage fees.

Deep Cold Archive

Deep Cold Archive provides highly durable storage at lower prices compared with Cold Archive. Deep Cold Archive has a minimum billable size of 64 KB and a minimum billable storage duration of 180 days. You must restore a Deep Cold Archive object before you can access it. The amount of time that is required to restore a Deep Cold Archive object varies based on the object size and restoration priority. You are charged data retrieval fees and API operation calling fees when you restore Deep Cold Archive objects. Deep Cold Archive is suitable for extremely cold data that needs to be stored for an extremely long period of time, including raw data that is accumulated over an extended period of time in the big data and AI fields, retained media resources, regulatory and compliance documents, and data that is archived by using tapes.

Note

Deep Cold Archive is supported in the following regions: China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), and Singapore.
If the size of a Deep Cold Archive object is smaller than 64 KB, you are charged for the minimum billable size. If a Deep Cold Archive object is stored for less than the minimum billable storage duration of 180 days, you are charged for the storage usage of the Deep Cold Archive object that is stored for less than the minimum storage duration. For more information, see Storage fees.

Differences between storage classes

Storage class	Redundancy type	Data durability	Service availability	Minimum billable size	Minimum storage duration	Data access frequency	Access latency
Standard	LRS	99.999999999% (11 9's)	99.99%	Actual size of objects	None	More than once a month	Real-time access
IA			99.00%	64 KB	30 days	Less than once a month	Real-time access
Archive			99.00%	64 KB	60 days	Less than once in 90 days	Real-time access after real-time access of Archive objects is enabled or access after an Archive object is restored. The amount of time required to restore an Archive object is approximately 1 minute.
Cold Archive			99.00%	64 KB	180 days	Less than once a year	Objects must be restored before you can access them. The amount of time required to restore an Archive object ranges from 1 to 12 hours.
Deep Cold Archive			99.00%	64 KB	180 days	Less than once a year	Objects must be restored before you can access them. The amount of time required to restore an Archive object is 12 or 48 hours.
Standard			99.00%	Actual size of objects	None	More than once a month	Real-time access
Standard	ZRS	99.9999999999% (12 nines)	99.995%	Actual size of objects	None	More than once a month	Real-time access
IA			99.50%	64 KB	30 days	Less than once a month	Real-time access
Archive			99.50%	64 KB	60 days	Less than once in 90 days	Real-time access after real-time access of Archive objects is enabled or access after an Archive object is restored. The amount of time required to restore an Archive object is approximately 1 minute.

References

By default, the storage class of objects uploaded to buckets is Standard. Standard is suitable for scenarios in which data needs to be frequently accessed and can be accessed with low latency. If you no longer need to frequently access specific objects or you want to reduce storage costs, you can convert the storage class of Standard objects to a more economical storage class, such as IA or Archive. For more information, see Convert storage classes.
Deep Cold Archive provides highly durable and low-cost storage for extremely cold data that needs to be stored for an ultra-long period of time. If you want to use Deep Cold Archive in a more cost-effective manner, see Best practices for using Deep Cold Archive.
If the storage usage of objects in the storage class of the destination objects increases, but the storage usage of the objects in the storage class of the source objects remains the same after the storage class of the source objects is converted, see Why does the storage usage of the objects in the storage class of the source objects remain the same after the storage class of the source objects is converted?