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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 385 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02
Question #: 385
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A company has 700 TB of backup data stored in network attached storage (NAS) in its data center This backup data need to be accessible for infrequent regulatory requests and must be retained 7 years. The company has decided to migrate this backup data from its data center to AWS. The migration must be complete within 1 month. The company has 500 Mbps of dedicated bandwidth on its public internet connection available for data transfer.
What should a solutions architect do to migrate and store the data at the LOWEST cost?

  • A. Order AWS Snowball devices to transfer the data. Use a lifecycle policy to transition the files to Amazon S3 Glacier Deep Archive.
  • B. Deploy a VPN connection between the data center and Amazon VPC. Use the AWS CLI to copy the data from on premises to Amazon S3 Glacier.
  • C. Provision a 500 Mbps AWS Direct Connect connection and transfer the data to Amazon S3. Use a lifecycle policy to transition the files to Amazon S3 Glacier Deep Archive.
  • D. Use AWS DataSync to transfer the data and deploy a DataSync agent on premises. Use the DataSync task to copy files from the on-premises NAS storage to Amazon S3 Glacier.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by dmscountera at March 11, 2021, 6:25 p.m.
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Oz3006
Highly Voted 3 years, 7 months ago
to me answer is A, if you try to transfer 700 Tb of data over the 500Mbps link it will take Total Transfer Time 141 Days, 1 Hours, and 22 Minutes, 38 Seconds so it can not be D since we have a 30 day window. It cant be C since it will take more than 30 days to deploy a direct connect.
upvoted 56 times
kraj
3 years, 7 months ago
Can u explain how you got 141 days with 500 Mbps? It seems too large. For me it comes below 20 days.
upvoted 5 times
letmein2
3 years, 6 months ago
500Mbps means it tansfers 500/8 = 62.5MB/s. In one day, it transfers (62.5 x 60 x 60 x 24) = 5.4TB. Overall it takes 130 days to finish 700TB.
upvoted 22 times
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robertomartinez
3 years, 6 months ago
Memory tip for quick computation just remember grossly that 1GBPs = 1TB in 3 hours 500Bmps = 1TB in 6 hours, so 4TB/day=> This will never work
upvoted 22 times
vvsandipvv
3 years, 6 months ago
you minimized our computational overhead
upvoted 6 times
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Rajjay
3 years, 6 months ago
I believe the answer is D. Lowest cost. 500MB/s = 0.5GB/s one month = 30*24*60*60 = 2592000 seconds If I can transfer 0.5GB/s, I can transfer 1296300 GB in a month 1296300 GB can be written as 1296.3 TB The question only mentions 700TB. Easily accomplished
upvoted 3 times
Microgen
3 years, 5 months ago
note that transfer speed is 0.5Gbit which is 62.5MBytes/s only
upvoted 9 times
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Rododendron2
3 years, 6 months ago
Real life does not work like that. Everyone from network knows that. Real speed of TCP session for data transfer depends on latency between hosts. Close to AWS DC = higher upload speed, far from DC (= high latency) = slower upload speed. TCP session needs management (TCP ack and windows). So if you see questions about transfer across Internet and circuit bandwidth, you know that this is not valid answer, just distraction.
upvoted 7 times
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dmscountera
Highly Voted 3 years, 7 months ago
A. Order AWS Snowball devices to transfer the data. Use a lifecycle policy to transition the files to Amazon S3 Glacier Deep Archive.
upvoted 12 times
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qax2022
Most Recent 2 years, 8 months ago
Selected Answer: C
500m/s*3600*24=43tb/day , good enough to transfoer 700tb in 30days,
upvoted 1 times
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Fyssy
2 years, 8 months ago
Selected Answer: A
1GBpS link will transfer 10TB of data in 1day 1GBpS link will transfer 700TB of data in 70days With 500MBpS it will take approx 140days
upvoted 2 times
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Harsh73
2 years, 8 months ago
A : Order AWS Snowball devices to transfer the data. Use a lifecycle policy to transition the files to Amazon S3 Glacier Deep Archive.
upvoted 1 times
Harsh73
2 years, 8 months ago
A company needs to migrate a large amount of data from an on-premises storage area network (SAN) to Amazon S3. The SAN currently has 200 TB of data and is receiving an additional 20 TB of data each month. The company has a 500 Mbps connection to the internet. What should the company do to migrate the data to Amazon S3 in the LEAST amount of time?
upvoted 2 times
Harsh73
2 years, 8 months ago
A. Use a file syncing application to sync the data to Amazon S3 over the internet through a public S3 endpoint. Sync any changed data the same way until the SAN is decommissioned. B. Use an AWS Snowball Edge Storage Optimized device to migrate the initial 200 TB of data to Amazon S3. Sync any changes data by using AWS DataSync until the SAN is decommissioned. C. Set up an AWS Site-to-Site VPN connection. Use a file syncing application to sync the data to Amazon S3 through a private S3 endpoint. Sync any changed data the same way until the SAN is decommissioned. D. Set up a 10 Gbps AWS Direct Connection connection. Migrate the initial 200 TB of data to Amazon S3 by using a file syncing application. Sync any changed data the same way until the SAN is decommissioned.
upvoted 2 times
Harsh73
2 years, 8 months ago
Please help!
upvoted 2 times
kharakbeer
2 years, 8 months ago
The answer is B
upvoted 1 times
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bora4motion
2 years, 9 months ago
Selected Answer: A
Do the math! Then you can answer the question. It will eliminate B C D and A will be the only available and correct option.
upvoted 1 times
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azi_2021
3 years ago
seems to be A but ... "This backup data must be available in the event of occasional regulatory" is this statement ok with deep archive ?
upvoted 4 times
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cutecolt
3 years ago
But there is a gap in A. First the data needs to be trasferred to S3 standard before applying life cycle policy to move Glacier.
upvoted 1 times
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Pryce94
3 years, 1 month ago
A AWS DataSync will take too long to transfer data
upvoted 1 times
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janvandermerwer
3 years, 2 months ago
Selected Answer: A
Agree with A
upvoted 1 times
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Lotzy
3 years, 3 months ago
Selected Answer: A
A correct, non of the other answers will provide enough connection speed to transfer 700TB in 1 month as many other users already correctly calculated.
upvoted 1 times
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SmartDude
3 years, 3 months ago
Selected Answer: A
Answer is A. Syncing 700 TB over internet is foolishness.
upvoted 1 times
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waiwaiyan
3 years, 3 months ago
Selected Answer: D
Let me choose D this time. Data Sync https://aws.amazon.com/datasync/faqs/ I think 700TB is still good for Datasync whereas Snowball is a petabyte-scale data transport solution
upvoted 1 times
petervu
3 years, 3 months ago
Incorrect. The time needed to transfer 700TB over 500 Mbps internet speed will be 700 * 1000 / 0.5 * 8 (seconds), roughly 4 months. We only have 1 month to complete the data migration.
upvoted 2 times
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jj22222
3 years, 4 months ago
A is right;
upvoted 1 times
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tezawynn
3 years, 6 months ago
Just get a snowball, you have enough time to ship and all. Headache with 500 Mb anyways. Glacier deep archive to store for 7 years.
upvoted 2 times
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narasimha554
3 years, 6 months ago
I choose A over D because using Datasync you can't directly archive your data to glacier..May be we need to use life-cycle policy here .........correct me if wrong
upvoted 5 times
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Akivox
3 years, 6 months ago
1400,000 sec --> 16.2037037 days Answer is D
upvoted 2 times
Harshul
3 years, 6 months ago
https://calctool.org/CALC/prof/computing/transfer_time
upvoted 1 times
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swadeey
3 years, 6 months ago
How you came to 1400,000? Please note customer has link of 500 Mbps, i.e. 62 MBPS so the upload will still limit to that, no matter what
upvoted 1 times
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