How Are the Durability and Availability of OBS?
OBS provides multi-level reliability assurance for storage media, servers, cabinets, data centers, and regions by leveraging the following technologies: slow disk or bad sector detection, intra-AZ device and data redundancy, cross-AZ data disaster recovery, cross-region replication, and more. OBS delivers up to 99.9999999999% (12 nines) of data durability, and up to 99.995% of availability, far higher than a conventional architecture would offer.
The 12 nines of durability means that the annual average loss rate of objects is expected to be 0.0000000001%. For example, if you store 100 million objects in OBS, only one object may be lost every 10,000 years.
Availability is the service continuity. The 99.995% availability means that if you keep accessing OBS for 100,000 minutes (about 69 days), you can expect less than 5 minutes of unavailability. In addition, the availability of OBS is double ensured by the Service Level Agreement. Compensation is offered if the committed service availability is not met.
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