Azure Storage Replication Strategies.


In this article, we can see the holistic outline of azure storage replication strategies

Azure Storage Replica:-

Microsoft Azure provides high availability and durability to all storage accounts by replicating the information stored in a storage account across different locations. This replication is transparent to the user/customers and is always performed. Therefore replication copies the information to different places in Azure’s infrastructure, ensuring that your data is protected against hardware or even datacenter failures.

There are several types of Replication strategies:

Locally redundant storage (LRS)

The locally redundant storage strategy provides 99.999999999% (11 nines) of durability over a given year of our data. Using this strategy, data will be copied inside the same datacenter in different fault domains.

Zone-redundant storage (ZRS)

The zone-redundant storage strategy is to provide 99.9999999999% (12 nines) over a given year. Data is copied between different availability zones inside the region where you created the storage account.

Geo-redundant storage (GRS)

Data is copied to a secondary region, and Geo-redundant storage is assured 99.99999999999999% (16 nines). Secondary regions are only pre-assigned and cannot be configured or changed. User can’t read data from the secondary region using this replication strategy, unless Microsoft Azure automatically performs a failover to the secondary region.

Read-access geo-redundant storage (RA-GRS) 

This strategy works like GRS, but it allows read-access to data stored in the secondary region.

Users can select the replication strategy during the creation of a storage account. Once the storage account has been created and the user sets the replica strategy, the user can switch to a different strategy, depending on the type of strategy you initially configured.
Storage accounts which configured with a ZRS strategy cannot be converted to or from any other replica strategy. We can only switch from LRS to GRS, or RA-GRS, and vice versa.

I hope now you have an awareness about azure storage replication strategies
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