Sunday, November 17, 2019

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

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