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Exam DP-201 topic 4 question 19 discussion

Actual exam question from Microsoft's DP-201

Question #: 19
Topic #: 4

You plan to implement an Azure Data Lake Gen2 storage account.
You need to ensure that the data lake will remain available if a data center fails in the primary Azure region. The solution must minimize costs.
Which type of replication should you use for the storage account?

A. geo-redundant storage (GRS)
B. zone-redundant storage (ZRS)
C. locally-redundant storage (LRS)
D. geo-zone-redundant storage (GZRS)

Show Suggested Answer

Suggested Answer: A 🗳️
Geo-redundant storage (GRS) copies your data synchronously three times within a single physical location in the primary region using LRS. It then copies your data asynchronously to a single physical location in the secondary region.
Incorrect Answers:
B: Zone-redundant storage (ZRS) copies your data synchronously across three Azure availability zones in the primary region. For applications requiring high availability, Microsoft recommends using ZRS in the primary region, and also replicating to a secondary region.
C: Locally redundant storage (LRS) copies your data synchronously three times within a single physical location in the primary region. LRS is the least expensive replication option, but is not recommended for applications requiring high availability.
D: GZRS is more expensive compared to GRS.
Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy

by H_S at March 16, 2021, 2:10 p.m.

Comments

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H_S

Highly Voted 4 years, 2 months ago

B. zone-redundant storage (ZRS) if a data center fails in the primary rigion, another datacenter in the same region could be a good solution and less expensive, do it's ZRS

upvoted 35 times

Hrabia

4 years, 1 month ago

key words are "fails in primary Azure region" . ZRS is within same region so answer GRS is correct

upvoted 6 times

alain2

4 years ago

IMO, key words are: "a data center fails" and "minimize costs" -> ZRS

upvoted 4 times

uzairahm

2 years, 11 months ago

I agree it says in the question that a "data center fails in the primary Azure region" not the full Azure region is down so the correct answer is B as cost needs to be reduced as well

upvoted 1 times

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Ous01

Most Recent 4 years ago

A region consists of more than one data center. If a data center fails, it doesn't mean the whole region is down. ZRS should be the right answer.

upvoted 2 times

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toandm

4 years ago

A is correct. To quote the provided link below: "However, ZRS by itself may not protect your data against a regional disaster where multiple zones are permanently affected". We can choose either GRS or GZRS. Since GRS is cheaper, it should be chosen. Link: https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy

upvoted 4 times

memo43

4 years ago

here is not mentioned regional disaster. you must focus to datacenter fails. So ZRS is enough. >>Zone-redundant storage (ZRS) copies your data synchronously across three Azure availability zones in the primary region.

upvoted 3 times

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Nidshi

4 years, 1 month ago

I think the given ans is correct, it should be GRS

upvoted 4 times

Larrave

3 years, 6 months ago

Correct answer is ZRS, as we have always more than one data center per region and we want to minimize costs.

upvoted 1 times

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captainbee

3 years, 11 months ago

Why? It says only a data centre has failed in the primary region, not that the whole region is fubared.

upvoted 1 times

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