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Exam 3V0-752 topic 1 question 36 discussion

Actual exam question from VMware's 3V0-752
Question #: 36
Topic #: 1
[All 3V0-752 Questions]

An architect is working on a physical desktop replacement using Horizon View.
The architect gathered this information from the customer:
✑ There are currently 500 physical desktops, all with traditional spinning hard drives.
✑ Each desktop peaks at 75 IOPS multiple times during the day.
✑ The average read/write ratio is 30% reads, 70% writes.
The architect decided to size the vSAN cluster to handle the workload using FTT=1 and Fault Tolerance Method of RAID-1.
Using only the information provided, what are the total calculated IOPS required for the vSAN cluster?

  • A. 75,000 IOPS
  • B. 48,750 IOPS
  • C. 63,750 IOPS
  • D. 37,500 IOPS
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by NNy at Feb. 11, 2020, 4:17 p.m.

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DonutTester
1 year, 3 months ago
C Read IOPS is the same no matter how many nodes. Write IO increase for every node added. So 500x75 = 37500. Then add 70% for the additional node to write to. That will be 500x75x170% = 63,750.
upvoted 1 times
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Ddssssss
1 year, 9 months ago
Selected Answer: A
37,500 per server. FTT 1 requires 2 servers. Cluster requires 2x 37,500
upvoted 3 times
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JoeTromundo
2 years, 7 months ago
"Using ONLY the information provided": 75*0,3=22,5 => READ 75*0,7=52,5 => WRITE 52,5*2=105 => WRITE PENALTY RAID 1 22,5 (R) + 105 (W) = 127.5 IOPS per Desktop 127.5*500 (Desktops) = 63,750 => C
upvoted 2 times
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vcixBrazil
3 years, 2 months ago
Guys, this is not a math exam.. VMware is not trying to force you to use a calculator. 500 Users 75 IOPs.. total is 37,750 IOPs required. if is FTT1 or 2 doesn't matter, the requirement will not change, the only difference can be on the amount of disks. Keep it simple, don't get to crazy on your answers.
upvoted 3 times
Ddssssss
1 year, 9 months ago
FTT1 requires 2 nodes, so whatever IIOPs you need, you need to multiply by 2. They asked for the total for the cluster.
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Physco
3 years, 7 months ago
Try this cal and check 75000 Answer - A http://www.hudop.com/tools/iopse.php
upvoted 2 times
dasmoove
3 years, 5 months ago
My answer to this is D. Based on dissecting the question, it does not give enough information to properly calculate vSAN. The line "Using only the information provided, what are the total calculated IOPS required for the vSAN cluster?" The following formula applies: As an example the following values will be used to run through a couple of sums – Number of workloads 100 Average Peak IOPs 59 % Read 74 % Write 26 RAID – Write Penalty 2 Formula: IO Profile = (Total Unit Workload IOPS × % READ) + ((Total Unit Workload IOPS × % WRITE) × RAID Penalty) (59 x 75%) + ((59 x 26%) x 2) (44.25) + ((15.34) x 2) 44.25 + 30.68 = 74.93 (IOPs Required) Rounded up to 75 IOPs Therefore, 75 IOPs per VM x Number of VMs you want to virtualise = Total IOPs required 75 IOPs x 100 VMs = 7500 IOPs (note: you may want to add 25% growth depending on customer requirements) https://vikernel.wordpress.com/tag/vmware-calculate-iops/
upvoted 1 times
MohamedZohair
3 months, 1 week ago
based on your explanation it should be C not D ?
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MosabSh
3 years, 10 months ago
Hi NNy , Thanks for your answers but you have to be sure , I failed by your comments this Quesi answers as it's : D , and now you change your mind
upvoted 1 times
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MosabSh
3 years, 10 months ago
Are you Sure would you please explain more how you get this answer I have two different dump with A as answer
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NNy
3 years, 11 months ago
New answer for me 'C' https://cloudmaster.co.in/vsan-calculator/ Total IOPS Required for Cluster = #VMs * (1.7 * IOPS/VM – 25 * %Read + 7.5)
upvoted 1 times
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NNy
3 years, 11 months ago
Using this iOPS calculator and the questions numbers you get D 37,500 the suggested answer A would be double this so why isn't D the correct answer? https://communities.vmware.com/docs/DOC-18924
upvoted 1 times
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