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AZ-104 Exam Question Walkthrough: Storage Redundancy
Learn to navigate Azure storage options with this AZ-104 exam question breakdown on high availability and redundancy.
You are tasked with implementing a storage solution for a company that requires high availability and redundancy for its critical data. They want to ensure that data is accessible even if a storage account becomes unavailable. What should you implement?
The question
- A. Locally Redundant Storage (LRS)
- B. Geo-Redundant Storage (GRS)
- C. Zone-Redundant Storage (ZRS)
- D. Read-Access Geo-Redundant Storage (RA-GRS)
Think before you scroll
Consider the requirements of high availability and redundancy. The solution must ensure data accessibility even if a storage account is down. Focus on how each storage option addresses these criteria.
The answer
The correct option is B. Geo-Redundant Storage (GRS). GRS replicates your data to a secondary region. This ensures that your data remains accessible during a regional outage, fulfilling the need for high availability and redundancy.
Why the other options lose
A. Locally Redundant Storage (LRS): LRS only replicates data within a single region. If that region goes down, access to the data is lost. It does not meet the requirement for high availability across regions.
C. Zone-Redundant Storage (ZRS): ZRS provides redundancy across availability zones within a region. While it offers some level of high availability, it does not protect against regional outages, making it insufficient for this scenario.
D. Read-Access Geo-Redundant Storage (RA-GRS): RA-GRS allows for read access to the secondary data. However, it does not enhance availability like GRS does. If the primary storage account becomes unavailable, RA-GRS does not ensure continued write access, which is critical for the company's needs.
The concept behind it
Understanding Azure's storage redundancy options is key. GRS is designed specifically for high availability across regions, ensuring that your critical data remains accessible during outages. Each option serves different needs: LRS for single-region redundancy, ZRS for local zone redundancy, and RA-GRS for read access only, but GRS is the only one that offers full redundancy across regions.
Exam trap to remember
Remember: GRS is your go-to for regional redundancy. Always prioritize data accessibility in multi-region scenarios.