Storage classes

MOS provides a range of storage classes for various data storage scenarios.

Class	Scenario
Standard	Frequently accessed data with millisecond access
IA (Infrequent Access)	Long-lived, infrequently accessed data (once a month) with millisecond access, which must be stored for at least 30 days
Archive	For long-term data that's rarely accessed and might need to be retrieved in minutes, which must be stored for at least 60 days. Data in this storage class is archived, and not available for real-time access.
Deep Archive	For extremely cold data that needs to be stored for an extremely long period of time (at least 180 days). Data in this storage class is archived, and not available for real-time access.

Differences between storage classes

Item	Standard	IA	Archive	Deep Archive
Data access	Real-time access with milliseconds of latency.	Real-time access with milliseconds of latency.	Data can be read after data is restored. The amount of time required to restore an Archive object is approximately 1~5 minutes.	Data can be read after data is restored. The amount of time required to restore an Archive object is approximately 5~12 hours.
Minimum storage duration	None	30 days	60 days	180 days
Minimum billable size	None	64 KB	64 KB	64 KB
Data retrieval fees	None	Based on the size of retrieved data. Unit: GB.	Based on the size of restored data. Unit: GB.	Based on the size of restored data and the selected data retrieval priority. Unit: GB.