Do you know when to use Geo Redundant Storage?
  v1.0 Posted at 11/02/2015 5:45 AM by Tiago Araujo

Data in Azure Storage accounts is protected by replication. Deciding how far to replicate it is a balance between safety and cost.​

Figure: It is important to balance safety and pricing when choosing the right replication strategy for Azure Storage Accounts

Locally redundant storage (LRS)

  • Maintains three copies of your data. 
  • Is replicated three times within a single facility in a single region. 
  • Protects your data from normal hardware failures, but not from the failure of a single facility.
  • Less expensive than GRS
  • Use when:
    • o Data is of low importance – e.g. for test websites, or testing virtual machines
    • o Data can be easily reconstructed
    • o Data is non-critical
    • o Data governance requirements restrict data to a single region

Geo-redundant storage (GRS). 

  • The default when you create it storage accounts.
  • Maintains six copies of your data. 
  • Data is replicated three times within the primary region, and is also replicated three times in a secondary region hundreds of miles away from the primary region
  • In the event of a failure at the primary region, Azure Storage will failover to the secondary region. 
  • Ensures that your data is durable in two separate regions.
  • Use when:
    • o Data cannot be recovered if los​t
Read access geo-redundant storage (RA-GRS). 
  • Replicates your data to a secondary geographic location (same as GRS)
  • Provides read access to your data in the secondary location
  • Allows you to access your data from either the primary or the secondary location, in the event that one location becomes unavailable.
  • Use when:​
    • o Data is critical, and access is required to both the primary and the secondary regions
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