Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company stores 200 TB of sensor images in an Azure Storage account. Compliance mandates that the data remain available even if an Azure region suffers an outage. During a regional outage, engineering teams must be able to download the most recent images from a secondary endpoint without waiting for Microsoft to initiate a failover. You need to choose a redundancy option that meets these requirements while minimizing cost.
Read-access geo-redundant storage (RA-GRS) asynchronously replicates data to a secondary region hundreds of miles away from the primary region and exposes a read-only secondary endpoint at all times. This allows applications to read the latest replicated data immediately during a regional outage, satisfying the availability and durability requirement.
Locally redundant storage provides durability only within a single datacenter and does not protect against regional failures. Zone-redundant storage distributes copies across availability zones in the same region, so it also cannot survive a full regional outage. Geo-redundant storage replicates to a secondary region but keeps the secondary endpoint blocked for reads until Microsoft performs a failover, so it fails the requirement for immediate read access. Therefore, RA-GRS is the most cost-effective option that meets both durability and read-access needs.
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What is the main difference between Geo-Redundant Storage (GRS) and Read-Access Geo-Redundant Storage (RA-GRS)?
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What are some scenarios where RA-GRS is a better choice over ZRS or LRS?
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How does asynchronous replication work in RA-GRS, and why is it important?
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Microsoft Azure Solutions Architect Expert AZ-305
Design data storage solutions
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