Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 228 discussion

Agree with B. With the Bursting Throughput mode, which is the default mode, the amount of throughput scales as your file system grows. So the more you store, the more throughput is available to you. Using the bursting throughput mode does not incur any additional charges and you have a baseline rate of 50 KB/s per GB of throughput that comes included with the price you pay for your EFS standard storage. Provisioned Throughput allows you to burst above your allocated allowance, which is based upon your file system size. So if your file system was relatively small but the use case for your file system required a high throughput rate, then the default bursting throughput options may not be able to process your request quickly enough. In this instance, you would need to use provisioned throughput. However, this option does incur additional charges where you will need to pay for any bursting above the default capacity allowed from the standard bursting throughput.

Keywords: data for all tasks needs to be stored - meaning EFS by each task is approximately 10 MB - meaning storage could get really low once archived optimized for high-frequency reading and writing not expected to exceed 1 TB - this one is begging not to chose Bursting mode “There are two throughput modes to choose from for your file system, Bursting Throughput and Provisioned Throughput. With Bursting Throughput mode, throughput on Amazon EFS scales as the size of your file system in the standard storage class grows. For more information about EFS storage classes, see EFS storage classes. With Provisioned Throughput mode, you can instantly provision the throughput of your file system (in MiB/s) independent of the amount of data stored.” High Throughput regardless of storage which can be provided only by B Reference: https://docs.aws.amazon.com/efs/latest/ug/performance.html

BBBBBBBBBBBBBBB

Provisioned to support the use case

B is the answer

New answer is D !

Why does EBS not work? Because it mentions "running on Amazon EC2 instances", EBS does not share among EC2 instances.

https://docs.aws.amazon.com/efs/latest/ug/performance.html "When burst credits are available, a file system can drive up to 100 MBps per terabyte (TB) of storage, with a minimum of 100 MBps. If no burst credits are available, a file system can drive up to 50 MBps per TB of storage with a minimum of 1 MBps" It is mentioned that the size of the EFS is not going to exceed 1 TB, and each job outputs 100 MB of data, and there will be hundreds of them. If we go with the burst throughput, we will have maximum 100 MB/s which will be enough just for 10 job output. So, we need provisioned throughput, which is B.

B is correct.

B IS RIGHT

Answer B: Provisioned Throughput mode is when Burst Throughtput mode is NOT enough. Is it enough? Burst can do 1TB file: 50MB continuouly and 100MB up to 12 hours What we need: each task 10MB and hundreds of tasks => more than 1TB thoughput. So not enough Have to escalate to Provisioned. https://docs.aws.amazon.com/efs/latest/ug/performance.html Answer B

I think B Amazon EFS Provisioned Throughput is available for applications with a high throughput to storage (MB/s per TB) ratio. For example, customers using Amazon EFS for development tools, web serving or content management applications, where the amount of data in their file system is low relative to throughput demands, are able to instantly get the high levels of throughput their applications require https://www.amazonaws.cn/en/efs/faq/

The answer is c throughput for file operations scales with your file system usage. Depending on the size of your data you get a certain number of burst credits, which allow you to get higher throughput for a limited time. For example, a 1-TiB file system runs continuously at a throughput of 50 MiB/second and is allowed to burst to 100 MiB/s for 12 hours each day.

The answer is C as per below. Q. What throughput can I drive against files stored in the EFS Standard-IA or EFS One Zone-IA storage class? The throughput you can drive against an Amazon EFS file system scales linearly with the amount of data stored on the EFS Standard or EFS One Zone storage classes. All Amazon EFS file systems, regardless of size, can burst to 100 MiB/s of throughput. File systems with more than 1 TiB of data stored on EFS Standard or EFS One Zone storage classes can burst to 100 MiB/s per TiB of data stored on EFS Standard or EFS One Zone storage classes. If you require higher amounts of throughput to EFS Standard-IA or EFS One Zone-IA storage classes than your file system allows, use Amazon EFS Provisioned Throughput. https://aws.amazon.com/efs/faq/

"The system should be optimized for high-frequency reading and writing" we cant make the throughput based on the size here where we have small size essentially. Ans is B.

I would take B D is out as EBS is of lower performance than EFS https://docs.aws.amazon.com/efs/latest/ug/performance.html: Throughput scale for EFS is higher than EBS A is eliminated since DynamoDB is not used for such a scenario "optimized for high-frequency reading and writing" -> take advantage of AWS capabilities https://aws.amazon.com/efs/faq/: "Provisioned Throughput enables Amazon EFS customers to provision their file system’s throughput independent of the amount of data stored, optimizing their file system throughput performance to match their application’s needs."

Provisioned throughput B for sure