Q19Design Resilient ArchitecturesMultiple answers
A solutions architect is designing a shared storage solution for a web application that is deployed across multiple Availability Zones. The web application runs on Amazon EC2 instances in an Auto Scaling group. The company plans to make frequent changes to the content. The solution must provide strong consistency so that new content is returned as soon as the changes occur. Which solutions meet these requirements? **(Choose two.)**
Select 2 answers.
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Discussion · 8
8
Correct answer BE
B, E 5
B & E seems to be the most logic
B, E 3
A - Volume Gateway is typically on-prem and optimized for hybrid setups, not for fully cloud-based solutions.
B - EFS provides a fully managed, shared file storage system that works across multiple AZs.
C - Even with Multi-Attach, sharing EBS volumes across AZs is pretty complex and error-prone.
D - DataSync is designed for periodic synchronization and not real-time, frequent updates.
E - The "no-cache" header ensures the content is always fetched fresh, and CloudFront delivers it efficiently with reduced latency. Although S3 is less efficient for frequent updates compared to a shared file system like EFS, but not a problem here.
2
BD looks most logical to me - continuous changes required an update via DataSync
2
Regarding storage, I'd go for EFS, although it never mentions the requirement for file storage.
Datasync can copy data between several storage types, including EFS, agents can be installed on EC2, but you cannot perform continuous synchronization of EC2 instances. Only storage.
Cloudfront can publish both passive (s3) and active content (EC2+EFS) but wording doesn't tell a thing about such a share. And if it's a passive site why do we even have 2 storage types...
I'd say, for me, the least bad solution seems to be B + E.
B, E 2
I choose BE
1
C is wrong: you cannot share EBS in multiple AZ
B, C 1
Option A is out as storage gateway is suited for hybrid cloud use cases where on-premises workloads need access to AWS cloud storage