Quick Answer
The correct answer is LRS and GRS, as these are the two valid replication options for Azure Blob Storage. Locally Redundant Storage (LRS) synchronously writes three copies of your data within a single datacenter in the primary region, protecting against server and drive failures but not against a full datacenter outage. Geo-Redundant Storage (GRS) builds on LRS by first replicating data three times synchronously in the primary region, then asynchronously copying it to a secondary region hundreds of miles away, ensuring durability even during a regional disaster. On the Azure Solutions Architect Expert AZ-305 exam, this question tests your understanding of redundancy trade-offs—common traps include confusing GRS with RA-GRS (which adds read access) or assuming ZRS is valid for Blob Storage when it is actually a separate option for other services. A key memory tip: think of LRS as “local only” and GRS as “geo-paired” with LRS as its foundation—remember that GRS always includes LRS inside the primary region.
This AZ-305 practice question tests your understanding of design data storage solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are valid replication options for Azure Blob Storage?
GRS (Geo-Redundant Storage)
GRS replicates data to a secondary region.
RA-GRS (Read-Access Geo-Redundant Storage)
Why wrong: RA-GRS is a feature of GRS, not a separate replication option.
LRS (Locally Redundant Storage)
LRS replicates data within a single datacenter.
ZRS (Zone-Redundant Storage)
Why wrong: ZRS is a redundancy option, not a replication type.
ASR (Azure Site Recovery)
Why wrong: ASR is for disaster recovery of virtual machines.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
GRS (Geo-Redundant Storage)
Azure Blob Storage offers multiple redundancy options to protect data against failures. GRS (Geo-Redundant Storage) replicates your data synchronously three times within a single primary region using LRS, then asynchronously replicates to a secondary region hundreds of miles away, ensuring durability even during a regional outage. LRS (Locally Redundant Storage) replicates data three times within a single datacenter in the same region, providing protection against server and drive failures but not against datacenter-level disasters.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
GRS (Geo-Redundant Storage)
Why this is correct
GRS replicates data to a secondary region.
Related concept
Read the scenario before looking for a memorised answer.
RA-GRS (Read-Access Geo-Redundant Storage)
Why it's wrong here
RA-GRS is a feature of GRS, not a separate replication option.
LRS (Locally Redundant Storage)
Why this is correct
LRS replicates data within a single datacenter.
Related concept
Read the scenario before looking for a memorised answer.
ZRS (Zone-Redundant Storage)
Why it's wrong here
ZRS is a redundancy option, not a replication type.
ASR (Azure Site Recovery)
Why it's wrong here
ASR is for disaster recovery of virtual machines.
Common exam traps
The trap here is that candidates often confuse RA-GRS as a separate replication option rather than recognizing it as an access feature of GRS, and they may overlook that ZRS is also a valid replication option but the question specifically expects GRS and LRS based on the classic redundancy tiers emphasized in the AZ-305 exam.
Detailed technical explanation
Under the hood, GRS uses asynchronous replication with a Recovery Point Objective (RPO) of typically less than 15 minutes, meaning data in the secondary region may lag slightly behind the primary. LRS provides 11 nines (99.999999999%) durability over a given year, but only within a single datacenter, making it vulnerable to datacenter-wide failures like fires or floods. In a real-world scenario, choosing LRS for critical financial transaction logs could lead to data loss if the entire datacenter goes offline, whereas GRS ensures a secondary copy is available in a different Azure region.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
The correct answer is: GRS (Geo-Redundant Storage) — Azure Blob Storage offers multiple redundancy options to protect data against failures. GRS (Geo-Redundant Storage) replicates your data synchronously three times within a single primary region using LRS, then asynchronously replicates to a secondary region hundreds of miles away, ensuring durability even during a regional outage. LRS (Locally Redundant Storage) replicates data three times within a single datacenter in the same region, providing protection against server and drive failures but not against datacenter-level disasters.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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