Data Platform Tips 1 - Data redundancy in Azure Storage

When we create a storage account on Azure, one of the following redundancy options can be chosen.

• Locally redundant storage (LRS)

• Zone redundant storage (ZRS)

• Geo redundant storage (GRS)

• Read Access Geo redundant storage (RA-GRS)

• Geo-zone-redundant storage (GZRS)

• Read-Access geo-zone-redundant storage (RA-GZRS)

Features	LRS	ZRS	GRS	RA-GRS	GZRS	RA-GZRS
Data Replication	Replicates data 3 times within same data center	Replicates data 3 storage clusters within same region physically separated from others	Replicates data to secondary region	Read-only access to secondary region in addition to geo-replication across 2 regions	Replicates data across 3 availability zones in primary region along with replicating in secondary region	Data can be read from both Primary and Secondary  endpoints.
Durability	99.999999999% (11 nines)	99.9999999999% (12 9's)	99.99999999999999% (16 9's)	99.99999999999999% (16 9's)	99.99999999999999% (16 9's)	99.99999999999999% (16 9's)
Supported Storage account types	GPv2, GPv1, Blob	GPv2	GPv2, GPv1, Blob	GPv2, GPv1, Blob	GPv2	GPv2