Tablestore provides zone-redundant storage (ZRS) for data center-level disaster recovery. Store data in instances within ZRS-supported regions to maintain high availability and strong consistency even if a data center fails.
Redundancy types
Tablestore offers two redundancy types: Locally redundant storage (LRS) and ZRS. To achieve higher service availability for your workloads, create instances in a region that supports ZRS.
In regions that support ZRS, new instances use ZRS by default. This setting is automatic and cannot be changed.
LRS
LRS uses a single-zone redundancy model to replicate your data across devices within the same zone. LRS is designed to ensure data durability and service availability if a hardware device in the zone fails.
LRS stores data within a single Availability Zone. If that zone becomes unavailable or all hardware within it fails simultaneously, the data becomes inaccessible.
ZRS
ZRS uses a multi-zone redundancy model to replicate your data across zones within the same region. If a zone becomes unavailable, ZRS ensures that your data remains accessible.
ZRS provides data center-level disaster recovery. If a zone within a region fails, Tablestore maintains strong consistency. The failover process is transparent to users, with no service interruption or data loss. This achieves a Recovery Time Objective (RTO) of 0 and a Recovery Point Objective (RPO) of 0, meeting the stringent requirements of mission-critical systems.
Compare redundancy types
The following table compares LRS and ZRS on data durability, service availability, and supported regions.
|
Dimension |
LRS |
ZRS |
|
Data durability |
99.999999999% (11 nines) |
99.9999999999% (12 nines) |
|
Service availability |
99.9% |
99.99% |
|
Supported regions |
China (Qingdao), China (Hohhot), China (Guangzhou), China (Chengdu), Malaysia (Kuala Lumpur), Philippines (Manila), Thailand (Bangkok), UK (London), US (Silicon Valley), US (Virginia), UAE (Dubai), SAU (Riyadh - Partner Region) |
China (Hangzhou), China (Shanghai), China (Beijing), China (Zhangjiakou), China (Ulanqab), China (Shenzhen), China (Hong Kong), Japan (Tokyo), Singapore, Indonesia (Jakarta), Germany (Frankfurt) |
Usage notes
-
An instance can have only one redundancy type. View an instance's redundancy type on the Tablestore console.
-
The redundancy type of a search index is independent of the instance's redundancy type. In regions that support ZRS, all search indexes use ZRS.
Billing
Using ZRS for an instance does not affect the existing billing rules.
References
To protect your data against accidental deletion or malicious tampering, use backup and restoration to back up table data.