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Domain 2.3: Recommend a Data Storage SolutionStorageRedundancyDisaster Recovery

AZ-305 · Question 29 · Domain 2.3: Recommend a Data Storage Solution

A healthcare company requires a storage solution for patient records.

Compliance mandates that the data must be highly available within the primary region, surviving a datacenter failure. Additionally, the data must be replicated to a secondary region hundreds of miles away for disaster recovery. In the event of a regional outage, the secondary region must be available for read access immediately without waiting for a failover.

Which storage redundancy option should you recommend?

Answer options:

A.

Zone-redundant storage (ZRS)

B.

Geo-redundant storage (GRS)

C.

Read-access geo-zone-redundant storage (RA-GZRS)

D.

Read-access geo-redundant storage (RA-GRS)

How to approach this question

Combine the requirements: 'survive datacenter failure' = Zone (Z). 'secondary region' = Geo (G). 'read access immediately' = Read-Access (RA). Result: RA-GZRS.

Full Answer

C.Read-access geo-zone-redundant storage (RA-GZRS)✓ Correct
Read-access geo-zone-redundant storage (RA-GZRS)
Read-access geo-zone-redundant storage (RA-GZRS) combines high availability and disaster recovery. It uses ZRS in the primary region to protect against datacenter failures. It replicates data to a secondary region for disaster recovery. The 'RA' (Read-Access) component ensures that applications can read data from the secondary region at any time, even if the primary region is healthy.

Common mistakes

Choosing RA-GRS, missing the requirement that the primary region must survive a datacenter failure (which requires the 'Z' for Zone).
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