Object Storage Service (OSS) provides locally redundant storage (LRS) and zone-redundant storage (ZRS) to ensure data durability and availability. LRS provides data redundancy within one zone, and ZRS provides data redundancy across zones.
LRS
LRS stores multiple copies of your data on multiple devices of different facilities in the same zone. LRS ensures data durability and availability even if hardware failures occur.
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 instead. For more information, see Overview.
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.
ZRS stores multiple data copies across zones in a region. If the region becomes unavailable, your data is inaccessible. If your business application requires higher availability, we recommend that you use cross-region replication to back up your data. For more information, see Overview.
Storage redundancy type comparison
The following table provides a comparison between LRS and ZRS.
Storage redundancy type | Storage class | Data durability | Availability |
LRS | Standard | 99.999999999% (11 nines) | 99.99% |
Infrequent Access (IA) | 99.00% | ||
Archive | 99.00% | ||
Cold Archive | 99.00% | ||
Deep Cold Archive | 99.00% | ||
ZRS | Standard | 99.9999999999% (12 nines) | 99.995% |
IA | 99.50% | ||
Archive | 99.50% |
Related operations
You can specify ZRS as the storage redundancy type when you create a bucket. For more information, see ZRS.
You can change the storage redundancy type of a bucket from LRS to ZRS. For more information, see Change the storage redundancy type of buckets.