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Exam 3V0-21.21 topic 1 question 19 discussion

Actual exam question from VMware's 3V0-21.21
Question #: 19
Topic #: 1
[All 3V0-21.21 Questions]

Refer to the exhibit.
During a requirements gathering workshop, the customer shares the following about their existing ESXi host virtual networking infrastructure:

The customer confirms that:
✑ Each ESXi host has approximately 200 virtual machines.
✑ They want to maximize the number of concurrent virtual machine migrations.
✑ When placing a host in maintenance mode, it takes a long time to evacuate the virtual machines.
Which two recommendations should the architect make in order to help the customer overcome their challenge? (Choose two.)

  • A. Configure the network to use MTU for the VMotion VMKernel to 1,600 bytes
  • B. Configure the network to use MTU for the VMotion VMKernel to 9,000 bytes
  • C. Create an additional standard switch with pNIC3 to use for vMotion
  • D. Use the 3 pNICs and bundle them in a link aggregation group (LAG) configuration
  • E. Use 10 GbE NICs instead of 1 GbE
Show Suggested Answer Hide Answer
Suggested Answer: BE 🗳️
Reference:
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html https://fasterdata.es.net/network-tuning/mtu-issues/debugging-mtu-problems/#:~:text=A%20jumbo%20frame%20is%20an,as%20large%20as%209%2C000%
20bytes.
by estornudo at April 3, 2021, 4:56 p.m.

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Aletzziss
Highly Voted 2 years, 10 months ago
B&C E is a recommendation but is an assumption to think they have budget "Use jumbo frames for best vMotion performance" https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html
upvoted 15 times
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estornudo
Highly Voted 3 years ago
I'd say B and E
upvoted 14 times
nemisis95
2 years, 10 months ago
10GBE is not a requirement for vMotion. vMotion network has at least 250 Mbps of dedicated bandwidth per concurrent vMotion session. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-3B41119A-1276-404B-8BFB-A32409052449.html We use C, to create an additional vSwitch with dedicated 1GB/ps network
upvoted 4 times
shav007
2 years, 5 months ago
but using 10gbe increases the concurrent migration to 8 from 4 which is also the client requirement - ''they want to maximize the number of concurrent virtual machine migrations''
upvoted 2 times
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EW3772
2 years ago
Refer to your link: You MUST ENSURE that the vMotion network has at least 250 Mbps of dedicated bandwidth per concurrent vMotion session. Greater bandwidth lets migrations complete more quickly. it is you must provide vMotion network at least 250Mbps, not vMotion network has at least 250Mbps.
upvoted 1 times
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VCIX_Chris
1 year, 5 months ago
Why an additional Switch for multi-nic-vmotion? An additional vmkernel would be sufficient.
upvoted 1 times
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FR_Wolfman
Most Recent 2 months, 4 weeks ago
Selected Answer: BE
BE are the right answer. A >> Changing the MTU from 1500 to 1600 won't help in anything B >> Switch to jumbo frames (MTU 9000) is one of the recommendations to improve vMotion performances (it works with vSAN too) C >> Creating a new standard switch and moving the vMotion to it won't help in anything D >> Aggregating the uplinks won't help, the vMotion parallelization with stays stuck at 4 VMs E >> Switching to a 10Gb network will push the limit from 4 VMs to 8 VMs moved in parallel.
upvoted 1 times
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guille804
9 months ago
For me B&E. Ya que C dice: Crear un adicional standar switch y la teoria dice que debe ser al mismo vss o vsd. vMotion con varias NIC: Puede configurar varias NIC para vMotion si agrega dos o más NIC al conmutador distribuido o estándar que se requiera. Para obtener información detallada, consulte el artículo de la base de conocimientos KB 2007467.
upvoted 1 times
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andr3
9 months, 2 weeks ago
Selected Answer: BE
so they are asking you for two recommendations: "Which two recommendations should the architect make..." recommendation is always to use 10GB net over 1GB and Jumbo frames for vMotion ANS: B E
upvoted 2 times
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safodz
10 months, 2 weeks ago
Selected Answer: BC
B & C of course ; E is out of subject her the host are configured with onle 01Gbe network
upvoted 1 times
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Alchot
1 year, 2 months ago
Selected Answer: BE
There is no constrain saying customer does not have budget or must use exisiting hardware. Assumption are being made that should be cleared by asking the questions. Therefore 10GbE network and Jumbo frames can be recommended. During design workshop customer can confirm if network fabric speed, free ports and budget for cables, NICs. If these then become constrains. LACP and Jumbo Frames can be recommended. NIOC should be also part of this question. IN MY OPINION
upvoted 2 times
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hicall
1 year, 5 months ago
Selected Answer: BE
B and E
upvoted 1 times
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Akhi69
1 year, 6 months ago
B&E C is talking about creating a new vSS which means that we cannot use multi-nic vmotion because the second switch will not see the nic used by the first vSS ? Am i wrong ?
upvoted 2 times
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Bobob55
1 year, 8 months ago
B and E. as that increases number of concurrent vmotions
upvoted 1 times
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OlekPL
1 year, 10 months ago
B&C, Best option on my opinion. We do not have info in exhibit about 10 GBE NICs.
upvoted 2 times
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mvojka1990
1 year, 11 months ago
LACP negotiating mode of the LAG has one active and one passive nic as by default. Here is the need for recommendations to overcome the challenge, not to have idela config, so, having jumbo is the first recommended move and second, dedicate one other pnic to use vmotion capabilities, seems to B and C.
upvoted 2 times
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Megalodon
2 years ago
Selected Answer: BE
Question states to maximize number of concurrent migrations, so 10 Gbs is best. C can also increase vmotion performance because of dedicated nic but no so much.
upvoted 2 times
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spam
2 years, 3 months ago
Selected Answer: CE
vMotion Best Practices The following are best practices when using vMotion: • Consider using a 10GbE vMotion network. Using a 10GbE network in place of a 1GbE network for vMotion will result in significant improvements in vMotion performance. When using very large virtual machines (for example, 64GB or more), consider using multiple 10GbE network adaptors for vMotion to further improve vMotion performance. https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/vmware-vmotion-performance-vsphere5.pdf
upvoted 1 times
spam
2 years, 3 months ago
10gb ethernet uses a default MTU of 9000
upvoted 1 times
tuvituvi
1 year, 8 months ago
No. it depends on the vmkernel config
upvoted 2 times
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Garbage
2 years, 3 months ago
B & E. 10Gb maximizes the amount of bandwidth, as well as increases the number of potential simultaneous vmotions.
upvoted 1 times
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anisss21
2 years, 4 months ago
C is not a valid option since it will be simply a replacement for current PNIC, be careful with the proposed solution which is a new standard switch . I would recommend Jumbo frame and aggregation
upvoted 1 times
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eric_jung
2 years, 4 months ago
Is there any way to scale the maximum number of migrations of virtual machines other than adding 10Gb NICs? Also, there is no condition on whether or not it can be used for the additional budget. Aren't the best answers that satisfy the conditions C,E?
upvoted 1 times
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