Help Center > > FAQs> Durability and Availability> What Are the Differences Between the Single-AZ Mode and Multi-AZ Mode in OBS?

What Are the Differences Between the Single-AZ Mode and Multi-AZ Mode in OBS?

Updated at: Mar 08, 2021 GMT+08:00

Question 1:

Q: What are the differences if the multi-AZ mode is enabled upon the creation of a bucket?

A: When the multi-AZ mode is enabled, data is redundantly stored in multiple AZs, improving data reliability. Data is stored in a single AZ if the multi-AZ mode is disabled, with lower costs. For details about pricing, see Product Pricing Details.

Question 2:

Q: Is data stored as copies in multiple AZs after the multi-AZ mode is enabled? If an AZ is faulty, is data complete in other AZs?

A: The Erasure Code (EC) algorithm, instead of multiple copies, is used to ensure data redundancy in the multi-AZ mode. If the multi-AZ mode is enabled for a bucket, data is stored in multiple AZs in the same region. If an AZ is unavailable, data can still be properly accessed in other AZs. The multi-AZ mode is suitable for data storage scenarios that require high reliability. The multi-AZ mode tolerates only single-AZ faults.

Question 3:

Q: Can I change the status of the multi-AZ mode without deleting the bucket?

A: No. If the multi-AZ mode is enabled upon creation of a bucket, it cannot be disabled. You can migrate data to another bucket and delete the bucket that has the multi-AZ mode enabled, if you do not need multi-AZ storage.

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