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VCAP 6.5 Design - 3V0-624. Q 14-20

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QUESTION 14

A company is implementing a new ESXi host cluster at its New York data center.

 

- The CIO has stated that the new ESXi cluster should be deigned with

enough failover capacity to sustain two ESXi host failures.

- Six ESXi hosts have been approved for this workload.

- The ESXi hosts are to be purchased from Dell with these specifications:

- 2x10 core 2.2GHz Intel CPU

- 128 GB of memory

- The workload is defined as 150 employee desktop virtual machines each

with 3GB RAM reserved.

- All virtual machines should be protected by vSphere High Availability

 

Which are two true statements regarding failover capacity? (Choose two.)

 

A. vSphete HA can be configured to reserve 25% of memory capacity for failover.

B. vSphete HA can be configured to specify two dedicated failover hosts.

C. vSphere HA can be configured to reserve 35% of memory capacity for failover.

D. vSphere HA can be configured to specify one dedicated failover host.

 

Answer: B C

 

 

QUESTION 15

A database administrator is operating a virtual machine (VM) configured with 16 vCPU and 64GB of RAM. A recent performance audit has indicated that this virtual machine is oversized and is using less than 60% of its configured CPU and memory capacity.

 

- The ESXi host that contains this VM has 2 physical processors with 10

cores per processor, and 128GB of RAM.

- This physical host's architecture is split into two equal NUMA nodes.

 

Which vCPU and RAM configuration for the VM allows for the most resources, but also provides the performance benefit of local NUMA access?

 

A. 16 vCPU and 32GB RAM

B. 4 vCPU and 16GB RAM

C. 10 vCPU and 64GB RAM

D. 12 vCPU and 64GB RAM

 

 

Answer: C

 

QUESTION 16

A company would like to leverage snapshot technology on vSphere 6.5.

Which configuration supports taking snapshots?

 

A. Windows Failover Cluster VM with RDM in virtual mode

B. vSphere Fault Tolerance VM C. Windows Failover Cluster VM with RDM in physical mode

D. SQL Always On Availability Group

 

QUESTION 17

An organization is trying to determine whether it should use the Windows version of the vCenter Server or use the vCenter Server Appliance (VCSA). The organization will be using an external Oracle database, and it will manage about 30 ESXi hosts and about 200 virtual machines on 1

vCenter Server, but it would also like to see another group's vCenter Server from the same vSphere client window. Which type of vCenter Server should it use, and why?

 

A. The vCenter Server Appliance (VCSA) because it can be used with Oracle

B. The VCSA because it can support 30 ESXi hosts

C. The Windows version because it can support Oracle

D. The Windows version because it can support Linked mode

 

 

QUESTION 18

When configuring HA, which admission control policy should be used?

 

A. Host Failure Cluster Tolerates

B. CPU and Memory Percentage for Failover

C. Standby Host

D. None of the above

 

QUESTION 19

When considering server consolidation, plan on running ___________ vCPUs per core.

 

A. 1 to 2

B. 3 to 4

C. 4 to 6

D. 6 to 8

 

QUESTION 20

When planning on resource use for the servers, you should plan on leaving resources available for all the following except __________.

 

A. patching

B. maintenance mode

C. future growth

D. log file space

 

QUESTION 21

Which of the following needs to be considered when determining the amount and size of the hosts required for a virtual design?

 

A. Aggregate CPU and memory requirements

B. Future growth

C. Number of vCPUs to be hosted per box

D. All of the above

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I have something scheduled. I will post my answers when I get back.

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I have something scheduled. I will post my answers when I get back.

 

take your time, its saturday at least

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14

A,D

 

Total resources

6 host

2x10 = 20x2.2 = 44x6 = 264 total CPU

128x6 = 768 total ram

 

Total use by user

150x3 = 450 total ram

 

With two host dedicated

100(total percentage resource) / 6(total usable host) = 16.67 round to 16.7 x 2(total host that can fail) = 33.4 round to 34

Memory calculation = (768-450)/768 = 0.41x100 = 41 - 34 = 7

 

With one host dedicated

16.7

Memory calculation = (768-450)/768 = 0.41x100 = 41 - 16 = 25

 

15

B

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opinion = NUMA will active if > 8 vCPU. The question said that more than 60% resource are idle. Half of existing VM are 8 CPU and 32 GB RAM, but it said more than 60 %.

 

16

A

 

17

A

VCSA external DB are oracle.

 

18

B

 

19

A

I dont know, i read it somehwere if it is not VDI, it is better just 1:2 ratio, unless VDI.

 

20

D

 

21

D

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14, B / C

15, C, each NUMA node has 1 socket (10 cpu) and presumably half the ram 64gb..

16, A /D

17, C, VCSA does not support external DB

18 A B

19 C but totally depends.. think this is a bogus or incomplete question

20 D

21 D

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14, B / C

15, C, each NUMA node has 1 socket (10 cpu) and presumably half the ram 64gb..

16, A /D

17, C, VCSA does not support external DB

18 A B

19 C but totally depends.. think this is a bogus or incomplete question

20 D

21 D

 

Hallo, thanks for correcting my wrong answer at question 17.

wrong reference =

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true reference

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But, can you tell me why you answer 14 B,C and 15 C ? thanks

 

edit answer 15

Which vCPU and RAM configuration for the VM allows for the most resources, but also provides the performance benefit of local NUMA access?

Just read also, NUMA kicked in if condition > 8 vCPU and/also vCPU more than pCPU. In this case, pCPU are 10, while vCPU also 10, which will still using local node.

Edited by sagitarius2k

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14 B/C -

 

6 hosts total, allow for 2 failed hosts.

 

rule out incorrect answers.

 

wrong - A. vSphete HA can be configured to reserve 25% of memory capacity for failover. - 2 hosts is 33% of total capacity

B. vSphete HA can be configured to specify two dedicated failover hosts.

C. vSphere HA can be configured to reserve 35% of memory capacity for failover.

wrong - D. vSphere HA can be configured to specify one dedicated failover host. - only 1 host

 

so B and C.

 

15, each host has 2 sockets, i.e. 2 NUMA nodes, each numa node has 10 pCPU and 128ram so thats the best envelope to fit inside. The VM has 16 vCPU but doesnt exceed 60% capacity (so thats lees than 9.6 vcpu, so 10 vcpu is peachy) - so if it gets 10 vcpu and its full 64gb of ram it can fit inside of 1 numa node, answer C.. it really is only between C and D as the other answers dont have enough ram and D has too many vcpu for 1 numa node.

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14 B/C -

 

6 hosts total, allow for 2 failed hosts.

 

rule out incorrect answers.

 

wrong - A. vSphete HA can be configured to reserve 25% of memory capacity for failover. - 2 hosts is 33% of total capacity

B. vSphete HA can be configured to specify two dedicated failover hosts.

C. vSphere HA can be configured to reserve 35% of memory capacity for failover.

wrong - D. vSphere HA can be configured to specify one dedicated failover host. - only 1 host

 

so B and C.

 

15, each host has 2 sockets, i.e. 2 NUMA nodes, each numa node has 10 pCPU and 128ram so thats the best envelope to fit inside. The VM has 16 vCPU but doesnt exceed 60% capacity (so thats lees than 9.6 vcpu, so 10 vcpu is peachy) - so if it gets 10 vcpu and its full 64gb of ram it can fit inside of 1 numa node, answer C.. it really is only between C and D as the other answers dont have enough ram and D has too many vcpu for 1 numa node.

 

Okay, thanks for your answer. For Q 14, i refer for this question from old test vcap 5.5

 

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Q 13.) Labtown has hired you in as a consult to help setup a new 12 host cluster. Each host has 2x8core 2.2GHZ Intel CPU's and 128GB of Memory. Labtown requires that four hosts can fail or go down for maintenance with the ability to still power up all VM's on the remaining hosts. The total resource usage by all the VM's on the cluster is 200Ghz CPU, 624GB Memory What percentage of cluster resources reserved admission control do you set in your installation document to meet the requirements so all VM's can start.

a.) 10%

b.) 15%

c.) 25%

d.) 33%

 

A = Explanation:

100 / 12 hosts = 8.3 * 4 = 33.3

 

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14.) Labtown has hired you in as a consult to help setup a new 12 host cluster. Each host has 2x8core 2.2GHZ Intel CPU's and 128GB of Memory. Labtown requires that four hosts can fail or go down for maintenance with the ability to still power up all VM's on the remaining hosts. The total resource usage by all the VM's on the cluster is 200Ghz CPU, 624GB Memory. If you set the admission control to 33% What percentage of cluster resources does your cluster still have to use to start VM's in the event of a failure with this reservation.

a.) 29% CPU capacity, 32% Memory Capacity

b.) 20% CPU capacity, 26% Memory Capacity

c.) 33% CPU capacity, 39% Memory Capacity

d.) 22% CPU capacity, 28% Memory Capacity

 

A = Explanation:

CPU calculation ((422.4GHZ - 200GHZ)/422.4GHZ) = 53% - 33% Reservation = 20%

Memory calculation ((1536GB - 624G)/1536GB) = 59% - 33% Reservation = 26%

 

The reason why i choose A,D

 

Total resources

6 host

2x10 = 20x2.2 = 44x6 = 264 total CPU

128x6 = 768 total ram

 

Total use by user

150x3 = 450 total ram

 

With two host dedicated

100(total percentage resource) / 6(total usable host) = 16.67 round to 16.7 x 2(total host that can fail) = 33.4 round to 34

Memory calculation = (768-450)/768 = 0.41x100 = 41 - 34 = 7

With one host dedicated

16.7

Memory calculation = (768-450)/768 = 0.41x100 = 41 - 16 = 25

 

If we chose 2 dedicated host for failover, it can only satisfied with 7-8 % RAM reservation. But it we chose 1 dedicated host for failover, it can satisfied 25 % RAM reservation.

 

This is why i love VCAP test. It gives different perspective for the question and answer.

Edited by sagitarius2k

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14, The CIO wants two ensure that if 2 hosts die you will not run into issues. So you need to reserve at least two hosts worth of capacity - if you only allow 25% then that doesn't reserve two full hosts.. so you will be able to power on more vms than 6 hosts can handle.

 

If you only reserve one host then you can power on enough vms to consume 7 hosts worth of resource.. if you lose another host then you dont have enough capacity to satisfy the CIO requirements.

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