OSS provides two storage redundancy types: zone-redundant storage (ZRS) and locally redundant storage (LRS). These types span single, dual, or multiple zones to ensure data durability and availability.
Choose a redundancy type
|
Factor |
ZRS |
LRS |
|
Scope |
Multiple availability zones (AZs) in a region |
Single AZ |
|
Data durability |
99.9999999999% (12 nines) |
99.999999999% (11 nines) |
|
Service availability |
Up to 99.995% (Standard) |
Up to 99.99% (Standard) |
|
Failure protection |
Survives a full AZ outage |
Survives hardware failures within an AZ |
|
Storage classes |
Standard, Infrequent Access, Archive Storage |
Standard, Infrequent Access, Archive Storage, Cold Archive, Deep Cold Archive |
|
Region coverage |
Select regions |
All public cloud regions |
Choose ZRS for production workloads that require high availability and protection against AZ-level failures.
Choose LRS when Cold Archive or Deep Cold Archive storage classes are required, as these classes support only LRS.
Zone-redundant storage (ZRS)
ZRS stores redundant copies of data across multiple availability zones (AZs) in a region. In regions with three or more AZs, copies span at least three zones; in regions with two AZs, copies span both. Data remains accessible even if one AZ becomes unavailable.
ZRS stores data within a single region. If the region becomes unavailable, data is inaccessible. For cross-region protection, use cross-region replication.
Locally redundant storage (LRS)
LRS stores redundant copies of data on multiple devices across multiple facilities within a single zone, ensuring durability and availability during hardware failures.
LRS stores data within a single zone. If the zone becomes unavailable, data is inaccessible. For higher availability, use zone-redundant storage (ZRS).
Comparison of storage redundancy types
The following table lists the data durability and service availability for each redundancy type and storage class.
|
Storage redundancy type |
Storage class |
Region |
Data durability |
Service availability |
|
Zone-redundant storage |
Standard |
China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), China (Hong Kong), Japan (Tokyo), Singapore, Indonesia (Jakarta), Malaysia (Kuala Lumpur), Germany (Frankfurt) |
99.9999999999% (12 nines) |
99.995% |
|
US (Silicon Valley), US (Virginia), Philippines (Manila), Thailand (Bangkok), South Korea (Seoul), UAE (Dubai), UK (London) |
99.99% |
|||
|
Infrequent Access |
China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), China (Hong Kong), Japan (Tokyo), Singapore, Indonesia (Jakarta), Malaysia (Kuala Lumpur), Germany (Frankfurt) |
99.50% |
||
|
Archive Storage |
||||
|
Locally redundant storage |
Standard |
All public cloud regions |
99.999999999% (11 nines) |
99.99% |
|
Infrequent Access |
99% |
|||
|
Archive Storage |
||||
|
Cold Archive |
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), Mexico, Japan (Tokyo), Singapore, Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Germany (Frankfurt), UK (London), UAE (Dubai) |
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|
Deep Cold Archive |
China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), Singapore |
|||
|
Standard (no region property) |
NA |
Service availability details are defined in the OSS Service Level Agreement.
Related operations
-
To create a bucket with the zone-redundant storage type, see Create a zone-redundant storage bucket.
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To convert a bucket from LRS to ZRS, see Convert the storage redundancy type of a bucket.