Wednesday, 2 March 2016

Difference between Azure storage replication services like LRS, GRS, RA-GRS and ZRS


LRS
Locally Redundant. Your data is replicated synchronously, so that there are three copies within a single facility in a single region. Locally Redundant Storage (LRS) protects your data against server hardware failures but not against the failure of the facility itself.


ZRS
Zone Redundant. Your data is replicated synchronously, so that there are three copies across
two or three facilities in a single region. Zone Redundant Storage (ZRS) is more redundant that
LRS but does not protect against failures that affect a while region. ZRS is only available for BLOB storage.

GRS
Geo-Redundant. Your data is replicated asynchronously, with three copies of the data in the
primary region, and three copies of the data stored in a secondary region. If there is failure at the primary region, Azure Storage will failover to the secondary region. Geo-Redundant Storage (GRS) is the most resilient of the replication schemes.


RA-GRS
Read-Access Geo-Redundant. As with GRS, your data is replicated asynchronously across two regions. However, with read-access GRS, the three copies in the secondary region are enabled for read-only access to the data, if the primary region is unavailable. 

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