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Exam VMCE2020 topic 1 question 30 discussion

Actual exam question from Veeam's VMCE2020

Question #: 30
Topic #: 1

[All VMCE2020 Questions]

The backup administrator configured replication for a VM from Data Center 1 to Data Center 2, which runs every day at 1 a.m. A power surge takes out Data
Center 1 at 7 a.m. and the administrator fails over the replica at 8 a.m. When the power comes back on, the administrator performs the `failback` action at 2 p.m. and checks the state of the original VM. They recognize that not all data is available. What is missing?

A. Data from 1 a.m. to 7 a.m.
B. Data from 1 a.m. to 2 p.m.
C. Data from 8 a.m. to 2 p.m.
D. Data from 7 a.m. to 8 a.m.

Show Suggested Answer

Suggested Answer: B 🗳️

by [deleted] at Dec. 16, 2020, 9:33 a.m.

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pporto

Highly Voted 4 years, 6 months ago

A is correct. There is no data replicated since the last replication at 1:00 a.m. until the 7 a.m. No data exists between 7 a.m and 8 a.m. as the machine is down. At 08:00 new data starts to be written in the new replica. Data loss is between 01:00 am and 07:00 am.

upvoted 13 times

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AndrewLin

Highly Voted 4 years, 6 months ago

Maybe D is correct Original VM had data from 1 a.m. to 7 a.m. Replica had data from 8 a.m. to 2 p.m. When failback, replica sync different data from 8 a.m. to 2 p.m. to original vm. So, data is missing form 7 a.m. to 8 a.m.

upvoted 12 times

reyand

3 years, 8 months ago

Just can't realize how the data can be written from 7 to 8 on DC1VM if there is no electricity.... If somehow new data is written from 7 to 8 on DC1VM then when the failback process starts at 2 pm veeam should calculate and synchronize the differences between data on DC2VM and DC1VM: DC1VM contains data until 8 am DC2VM contains data until 1 am and from 8 am to 2pm The data saved from 8am to 2pm on DC2VM is transported to he DC1VM which contains data until 8 am (or 7am if data is not written during the power surge) Guess what is missing? May be the data from 7 to 8 am is missing because it was never created or it's created but veeam failback process don't know about it?

upvoted 2 times

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Morkall

Most Recent 2 years, 4 months ago

Selected Answer: A

A is correct

upvoted 1 times

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tungxp

3 years, 1 month ago

Selected Answer: D

The correct answer should be D, Please see this video that had exactly situation like question, (from 7:00 to 7:30) https://youtu.be/jrSg5oXCmXU?t=420

upvoted 1 times

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tdsn123_1

3 years, 10 months ago

B unfortunally is correct: The difference of the disks from site 1 to site 2 is 1AM to 7AM (7 to 8 nobody worked without light). They worked with the data from 1AM and finished work at 2PM. VMs with data from 1 to 7AM was changed to "NEW VMs" from failover with data only 1AM and 8AM to 2PM.

upvoted 5 times

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dandu

4 years, 1 month ago

correct is A

upvoted 3 times

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gpldiego

4 years, 4 months ago

It´s D, since VEEAM is checking the state of the Original VM (which indeed was working until 7 am), the only gap where no Data is written is between 7 an 8. If the VM were completly lost in DC01 at 7 am there would apply the answer A, otherwise Data is still in DC01 at the momment the power outage occurs and comes back.

upvoted 3 times

Angegardien

4 years, 3 months ago

replica is made at 1:00AM, if the VM dies at 7:00am where do you get the data 1:00AM-7:00AM from?

upvoted 4 times

arojasm

3 years, 9 months ago

the data from 1am to 7am is on the original VM because you didnt lost the entire DC, when you failback you sync the replicated VM with the original VM, so you only lost data from 7-8am

upvoted 3 times

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eduzimrs

4 years, 4 months ago

It's A, the data loss window is between 1AM to 7AM, that's when to power surge happened e no further data was written, there is no power to feed the servers.

upvoted 3 times

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reader278

4 years, 4 months ago

Answer should be D since this is the window where no data was available replicated between sites. There was no data on ether site during the outage 7am-8am see https://helpcenter.veeam.com/docs/backup/hyperv/failback.html?ver=100

upvoted 2 times

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Iptahul

4 years, 5 months ago

I think D is correct.

upvoted 2 times

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Andy849

4 years, 5 months ago

It should be D.

upvoted 2 times

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psamohin

4 years, 5 months ago

D. Read the following https://helpcenter.veeam.com/docs/backup/vsphere/failback.html?ver=100

upvoted 3 times

psamohin

4 years, 5 months ago

Veeam Backup & Replication calculates the difference between disks of the original VM and disks of the VM replica in the Failover state. Difference calculation helps Veeam Backup & Replication understand what data needs to be transported to the original VM to synchronize it with the VM replica.

upvoted 2 times

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dbello

4 years, 5 months ago

The answer is A. No replication between 1:00 AM - 7:00 AM When I failback I have the data until 1:00 AM + data between 8:00 AM - 2:00 PM

upvoted 5 times

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Ofero

4 years, 6 months ago

A is correct, Data is lost from the last replication until the failover starts

upvoted 3 times

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JesterVS

4 years, 6 months ago

A is correct. Because: replication is at 1 a.m. All the data from 1 a.m. to 7 a.m. is lost because production VM is taken out by a power surge. New data is written from 8 a.m. to 2 p.m. So, we have lost all the data from replication to 7 a.m. (from 7 a.m. to 8 a.m. no data was written also)

upvoted 3 times

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gmalan

4 years, 6 months ago

C. Data from 8 a.m. to 2 p.m. Its the new data generated

upvoted 2 times

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