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Difficulty: EasyData Redundancy and High Availability

VeloCart Delivery is designing an Azure Storage account to host customer delivery records. The storage solution must synchronously replicate data across three availability zones in the primary region. Additionally, the data must be replicated to a secondary region to protect against a regional outage. Which two Azure Storage redundancy options meet these requirements?

  1. Geo-zone-redundant storage (GZRS)Answer
  2. Read-access geo-zone-redundant storage (RA-GZRS)Answer
  3. C
    Geo-redundant storage (GRS)
  4. D
    Locally redundant storage (LRS)

Answer

Geo-zone-redundant storage (GZRS) and Read-access geo-zone-redundant storage (RA-GZRS) are the two redundancy options that meet both the zone-redundant replication in the primary region and geo-replication to a secondary region.
To satisfy both requirements, the storage account must replicate data across three availability zones in the primary region (zonal redundancy) and to a secondary region (geo-redundancy). Geo-zone-redundant storage (GZRS) and read-access geo-zone-redundant storage (RA-GZRS) both achieve this by combining zone-redundancy in the primary region with geo-redundancy to a secondary region.

Step-by-Step Solution

1
Identify the replication requirement in the primary region.
The requirement specifies synchronous replication across three availability zones within the primary region, which requires zone-redundant capability.
This rules out locally redundant storage (LRS) and geo-redundant storage (GRS), which only copy data within a single datacenter in the primary region.
2
Identify the cross-region replication requirement.
The requirement specifies replication to a secondary region to protect against a regional outage, which requires geo-redundant capability.
This rules out standard zone-redundant storage (ZRS), which replicates only within the primary region.
3
Select options that satisfy both zone-redundancy in the primary region and replication to a secondary region.
Geo-zone-redundant storage (GZRS) and read-access geo-zone-redundant storage (RA-GZRS) combine zone-redundant storage (ZRS) in the primary region with geo-redundancy to a secondary region.
Both GZRS and RA-GZRS satisfy all of the given design constraints.

Key Concept

Azure Storage redundancy options combining zone-redundant storage and geo-redundant storage to protect against datacenter and regional outages.
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Topics

Data Redundancy and High Availability

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