Examkin

Question

Difficulty: EasyData Redundancy and High Availability

Tailwind Traders is designing a storage solution for critical database backups. The backups must be protected against a regional disaster. The recovery time objective (RTO) requires these backup files to be accessible for immediate restore operations at any time without rehydration delays. Which storage configuration should be selected to meet these requirements?

  1. A
    LRS (Locally Redundant Storage) in the Hot tier
  2. B
    GRS (Geo-Redundant Storage) in the Archive tier
  3. GRS (Geo-Redundant Storage) in the Hot tierAnswer
  4. D
    RA-GRS (Read-Access Geo-Redundant Storage) configured to allow direct writes to both regions

Answer

GRS (Geo-Redundant Storage) in the Hot tier
Selecting GRS (Geo-Redundant Storage) in the Hot tier provides the necessary regional redundancy to survive a complete outage of the primary region. Storing the database backups in the Hot tier ensures that the files remain online and can be retrieved immediately without the latency associated with rehydrating data from the Archive tier.

Step-by-Step Solution

1
Evaluate the regional resilience requirement.
LRS is eliminated because it only replicates data within a single datacenter, whereas GRS provides replication to a secondary region to survive regional disasters.
The scenario requires protection against a regional disaster.
2
Evaluate the accessibility requirement.
The Archive tier is eliminated because it requires rehydrating data to an online tier before access, which takes hours and violates the immediate access requirement.
The RTO requires immediate accessibility without rehydration delays.
3
Verify write capabilities of the secondary region.
RA-GRS cannot be configured to allow direct writes to both regions, as secondary regions in Azure geo-redundant storage are read-only prior to failover.
Azure storage replication architecture only supports read access on the secondary endpoint.

Key Concept

Azure Storage replication tiers and access tier capabilities
Rate this question

Topics

Data Redundancy and High Availability

More questions from this topic