Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 310 discussion

Q: When do I use AWS DataSync and when do I use AWS Storage Gateway? A: Use AWS DataSync to migrate existing data to Amazon S3, and subsequently use the File Gateway configuration of AWS Storage Gateway to retain access to the migrated data and for ongoing updates from your on-premises file-based applications. You can use a combination of DataSync and File Gateway to minimize your on-premises infrastructure while seamlessly connecting on-premises applications to your cloud storage. AWS DataSync enables you to automate and accelerate online data transfers to AWS Storage services. After the initial data transfer phase using AWS DataSync, File Gateway provides your on-premises applications with low latency access to the migrated data. When using DataSync with NFS shares, POSIX metadata from your source on-premises storage is preserved, and permissions from the source storage apply when accessing your files using File Gateway. Answer is A.

A The file gateway employs a local read/write cache to provide a low-latency access to data for file share clients in the same local area network (LAN) as the file gateway. https://docs.aws.amazon.com/whitepapers/latest/file-gateway-hybrid-cloud-storage-architectures/file-gateway-architecture.html

I chose D

AWS Storage Gateway is a hybrid cloud storage service that gives you on-premises access to virtually unlimited cloud storage. Storage Gateway provides a standard set of storage protocols such as iSCSI, SMB, and NFS, which allow you to use AWS storage without rewriting your existing applications. It provides low-latency performance by caching frequently accessed data on premises, while storing data securely and durably in Amazon cloud storage services. https://aws.amazon.com/storagegateway/faqs/

A is the correct one.

A IMO- preserving low-latency access to the data from the on-premises application is key DataSync is for one time migration.

Answer is A Key words are: while maintaining low-latency access to the data from the on-premises application. DataSync is a migration tool, Storage gateway is better for a hybrid environment where on-premises apps still require access to the migrated data.

A or D, please confirm us.

Answer: D https://aws.amazon.com/efs/faq/ Q. How do I load data into a file system? AWS DataSync provides a fast and simple way to securely sync existing file systems with Amazon EFS. DataSync works over any network connection, including with AWS Direct Connect or AWS VPN. AWS Direct Connect provides a high bandwidth and lower latency dedicated network connection, over which you can mount your Amazon EFS file systems. You can use AWS DataSync to copy files between two Amazon EFS file systems, including those in different AWS regions and those belonging to different AWS accounts. You can also use standard Linux copy tools to move data files to Amazon EFS.

"While maintaining low latency access " - Storage gateway and then to S3. Answer is A

EFS does not provide cache in local, whereas file storage gateway does --- low latency A is correct

With this blog, it seems answer is D. https://aws.amazon.com/blogs/aws/amazon-efs-update-on-premises-access-via-direct-connect-vpc/ Any thoughts ?

Once deployed in your data center and associated with your AWS account, your configured S3 buckets will be available as Network File System (NFS) mount points. Your applications read and write files and directories over NFS, interfacing to the gateway as a file server. In turn, the gateway translates these file operations into object requests on your S3 buckets. Like existing volume and tape gateways, your most recently used data is cached on the gateway for low-latency access, and data transfer between your data center and AWS is fully managed and optimized by the gateway. Once in S3, you can access the objects directly or manage them using features such as S3 Lifecycle Policies, object versioning, and cross-region replication.

A https://aws.amazon.com/about-aws/whats-new/2016/11/aws-storage-gateway-provides-a-file-interface-to-objects-in-your-amazon-s3-buckets/

It must be D. everytime I saw a question about NFS migration, using EFS is AWS recommended. I almost gonna go with A but D is also correct and it is using EFS. so D for me

Answer its A the direct connection it's a distraction the question says: maintaining low-latency access to the data from the on-premises application. This is gateway A. It's ok, seems to be the best B. We can't do this without direct connect C. Not volume D. Data sync is ok but we need low-latency access to the data from on-premise.

my answer is D https://aws.amazon.com/datasync/?whats-new-cards.sort-by=item.additionalFields.postDateTime&whats-new-cards.sort-order=desc DataSync can copy data between Network File System (NFS) shares, Server Message Block (SMB) shares, self-managed object storage, AWS Snowcone, Amazon Simple Storage Service (Amazon S3) buckets, Amazon Elastic File System (Amazon EFS) file systems, and Amazon FSx for Windows File Server file systems.