Geo-Redundant Storage (GRS) GRS makes three synchronous copies of the data in the
primary region for high availability, and then it asynchronously makes three replicas in a paired
region for disaster recovery. Each Azure region has a defined paired region within the same
geopolitical boundary for GRS. For example, West US is paired with East US. This has a small
impact on scalability targets for the storage account. The GRS copies in the paired region are not
accessible to you, and GRS is best viewed as disaster recovery for Microsoft rather than for you. In
the event of a major failure in the primary region, Microsoft would make the GRS replicas
available, but this has never happened to date.
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