Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 448 discussion

So practically everyone here is wrong. because it is A. Here is why B is wrong because one there is no such thing as bursting mode for Lustre that is an EFS thing, but also Backup will not work for the RPO. C is wrong obviously because GP3 can't be shared. D is wrong because Datasync tasks cannot be scheduled for any more frequent then hourly so no D is wrong because you cannot schedule data sync tasks less then hourly so you don't meet the RPO. So all of those are easily wrong because they have bad information. They fooled everyone on A because all they say is the 'Active working set is 100GB" not the entire filesystem. EFS accumulates bursting credits so for every 100GB of filesystem size you can burst up to 300MiBps for up to 72 minutes. So you provision 75MiBps because that would average out over time so you aren't being overcharged for the provisioned size.

A scheduled task runs at a frequency that you specify, with a minimum interval of 1 hour. https://docs.aws.amazon.com/datasync/latest/userguide/task-scheduling.html

A. EFS support cross region replication. e4bc18e already point why D is wrong.

big thank to e4bc18e

A Solution write by e4bc18e

D is correct. "You can use DataSync to transfer files between two FSx for OpenZFS file systems, and also move data to a file system in a different AWS Region or AWS account. You can also use DataSync with FSx for OpenZFS file systems for other tasks. For example, you can perform one-time data migrations, periodically ingest data for distributed workloads, and schedule replication for data protection and recovery." https://docs.aws.amazon.com/fsx/latest/OpenZFSGuide/migrate-files-to-fsx-datasync.html

Selected Answer: B https://docs.aws.amazon.com/fsx/latest/LustreGuide/performance.html#fsx-aggregate-perf

D: The throughput is related to size of the EFS, but the question said the active set of the data will be only up to 100GB, with that size, the throughout will be lower than requested. so D:

D involves managing separate file systems that do not natively offer a "single location" experience across regions without additional configuration and replication mechanisms.

D a sneaky question since my first impression is go for A but it is wrong due to the 75M throughput mode. What's the calculation here? one region has 3 AZ? so 75x3=225?. EFS is not provisioned in that way. Even that, the 225 is the total throughput where question asked 225 for read. Implied the total would be more like 225+XXX. Anyway, A is wrong. https://docs.aws.amazon.com/efs/latest/ug/performance.html C is wrong since EBS multi attach don't support gp3 https://docs.aws.amazon.com/ebs/latest/userguide/ebs-volumes-multi.html

D is the answer. A would also have worked.

Amazon FSx for OpenZFS is a fully managed file system service that supports native replication between regions, making it well-suited for DR scenarios with a low RPO requirement. Using AWS DataSync for replication every 10 minutes ensures that the DR copy stays up to date with minimal data loss. This solution provides the required read throughput, data replication, and DR capabilities with less operational overhead.