Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
A company hosts a media-streaming web app in the East US 2 region. User-uploaded videos are stored in an Azure general-purpose v2 storage account that currently uses locally redundant storage (LRS). After a recent region-wide outage, the CTO asks you to redesign the storage layer to achieve the following goals:
Videos must remain available for read access if the entire East US 2 region becomes unavailable.
Write operations must continue to be directed only to East US 2 to keep latency low.
The solution should meet or exceed a 99.99 percent SLA for read availability while keeping costs lower than options that add both zone and geo redundancy.
Which Azure Storage redundancy option should you recommend?
Geo-zone-redundant storage (GZRS)
Zone-redundant storage (ZRS) in the East US 2 region
Read-access geo-redundant storage (RA-GRS) keeps three synchronous copies in the primary region and maintains asynchronous geo-replication of another three copies to a paired secondary region. Because the secondary endpoint is readable at all times, applications can switch to it automatically or manually if the primary region is unavailable, providing up to 99.99 percent read availability. Writes still occur only in the primary region, so application latency and cost remain lower than options such as geo-zone-redundant storage (GZRS) or read-access GZRS, which add zone-level replication and higher pricing. Zone-redundant storage (ZRS) protects only against single-zone failures within one region, and standard GRS does not allow reads from the secondary until after a failover. Therefore, RA-GRS is the appropriate choice.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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