Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 277 discussion

Storage gateway is not used for storing content - only to transfer to the Cloud

There is no on-prem/non Aws infrastructure to create a gateway. Also, EFS+EBS is more expensive that EFS and S3. So D is the best option.

Option D (S3 + EBS) is the most cost-effective and scalable choice for a service that involves storing video content and performing I/O-intensive transcoding for mobile platforms. Option A (S3 File Gateway) could work for applications with strict file system requirements but is less optimal for high-performance transcoding which is required by this online service

D. Use Amazon S3 for storing the video content. Move the files temporarily over to an Amazon Elastic Block Store (Amazon EBS) volume attached to the server for processing. Amazon S3 (Simple Storage Service) is highly durable, scalable, and cost-effective for storing large volumes of data, such as video content. It offers lower storage costs compared to Amazon EFS and is suitable for storing large files like video content. For processing the video content, you can temporarily move the files from Amazon S3 to an Amazon EBS volume attached to the EC2 instances. This approach allows you to leverage the high-performance storage of Amazon EBS for processing, while still benefiting from the cost-effectiveness of Amazon S3 for long-term storage. Once processing is complete, you can remove the temporary files from the EBS volume and store the final results back in S3.

Answer is closer to the following principle and D is near impossible to implement: "Amazon S3 File Gateway – Amazon S3 File Gateway supports a file interface into Amazon Simple Storage Service (Amazon S3) and combines a service and a virtual software appliance. By using this combination, you can store and retrieve objects in Amazon S3 using industry-standard file protocols such as Network File System (NFS) and Server Message Block (SMB). You deploy the gateway into your on-premises environment as a virtual machine (VM) running on VMware ESXi, Microsoft Hyper-V, or Linux Kernel-based Virtual Machine (KVM), or as a hardware appliance that you order from your preferred reseller. You can also deploy the Storage Gateway VM in VMware Cloud on AWS, or as an AMI in Amazon EC2. The gateway provides access to objects in S3 as files or file share mount points. With a S3 File Gateway, you can do the following"

A is correct For D, how to move file from S3 to EBS temporarily????

I was initially going for D but EBS part makes no sense as it is not possible. Closest explanation of A is in this article: https://aws.amazon.com/blogs/storage/mounting-amazon-s3-to-an-amazon-ec2-instance-using-a-private-connection-to-s3-file-gateway/ A is missing a lot of key steps but D is just impossible. Maybe it's just the wording?

EFS is already used, why EBS is an option in the answer?

AWS Storage Gateway S3 file gateway can be setup on EC2 ( https://repost.aws/knowledge-center/file-gateway-ec2 ). It use local disks/EBS for caching data. D: Can be used too, using attached EBS volume to each EC2 instance to process files. If require single EBS volume to be attached to multiple EC2, then it is possible too if they are in the same Availability Zone -> https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volumes-multi.html. For me A and D both are possible, but expect AWS would like to select Storage GW

A would work, "Storage Gateway for files" can provide access to S3 (cheap) via NFS (what the clients are using now). It has some additional cost in addition to the S3 charges, but would still be way cheaper than EFS. B would work for a single server, but as it provides a volume via iSCSI, it could be mounted only to a single server - does not meet the 'multiple instances can access' requirement. C and D do not meet the 'multiple instances can access' requirement because EBS can't be easily attached to all servers at the same time.

Storage gateway is intended for on-premises applications to access cloud storage, so A, B is out. The question explicitly states that the files are uploaded and stored in EFS, not S3, so D is not correct. The answer is C. The EFS storage costs 10 times more than EBS, so moving files to EBS after processing is the solution.

Answer D is correct. Storage gateway is not used for storing content - only to transfer to the Cloud

Cost effective = Use Amazon S3 for storing the video content. Move the files temporarily over to an Amazon Elastic Block Store (Amazon EBS) volume attached to the server for processing

Amazon S3 provides low-cost object storage for storing large amounts of unstructured data like videos. The videos can be stored in S3 durably and reliably. For processing, the video files can be temporarily copied from S3 to an EBS volume attached to the EC2 instance. EBS provides low latency block storage for high performance video processing. Once processing is complete, the output can be stored back in S3.

The question doesn't give enough information. Well, quite a few AWS exam questions don't provide enough info. Ideally, A could be the best answer if it mentions S3 as the backend of storage gateway. Because if it doesn't mention S3 as the backend, that implies either Storage gateway as the storage(which is impossible) or continue using EFS(also impossible). D is not ideal, because it will introduce video download cost for downloading files from S3 to EBS temporary storage. But it is the best option we have.

A more cost-effective storage solution for this scenario would be Amazon Simple Storage Service (Amazon S3). Amazon S3 is an object storage service that offers high scalability, durability, and availability at a lower cost compared to Amazon EFS. By using Amazon S3, you only pay for the storage you use, and it is typically more cost-efficient for scenarios where data is accessed less frequently, such as video storage for processing.

The result should be A. Amazon storage gateway has 4 types, S3 File Gateway, FSx file gateway, Type Gateway and Volume Gateway. If not specific reference file gateway should be default as S3 gateway, which sent file over to S3 the most cost effective storage in AWS. Why not D, the reason is last sentence, there are multiple EC2 servers for processing the video and EBS can only attach to 1 EC2 instance at a time, so if you use EBS, which mean for each EC2 instance you will have 1 EBS. This rule out D.