Home » VMware » VCP550D » Which cluster advanced HA setting can the administrator modify to enable the virtual machine to power on?
A vSphere administrator manages a three host cluster with 20 VMs. The HA cluster is configured with the Host Failures the Cluster Tolerates admission control policy and all other settings are set to default values. The administrator determines that one of the VMs is not able to power on. After further inspection, it is determined that this VM cannot power on because of a very large CPU reservation.
Which cluster advanced HA setting can the administrator modify to enable the virtual machine to power on?
A. Lower das.vmcpumaxmhz attribute value
B. Higher das.vmcpuminmhz attribute value
C. Lower das.slotcpuoutmhz attribute value
D. Higher das.slotcpuinmhz attribute value
Correct Answer: D
Explanation/Reference:
Explanation:
The admission control policy that configures the number of host failures a cluster tolerates uses slot sizes as a generalized representation of a virtual machine in the environment. In vSphere 5.0 and newer, a slot size is set at the highest reservation of memory or CPU.
In this question, the VM has a very large CPU reservation. This results in a large slot size resulting in fewer available slots on the hosts in the cluster. vSphere therefore thinks there are insufficient resources to power on the VM with the large CPU reservation.
We can use the das.slotcpuinmhz attribute value to set the maximum CPU size of a slot.
The answer “Higher das.slotcpuinmhz” is confusing because you would expect “Lower das.slotcpuinmhz” to be the answer. However, “Lower das.slotcpuinmhz” is not given as an answer. “Higher das.slotcpuinmhz” is the only valid answer.
As long as the higher das.slotcpuinmhz attribute value results in a slot size that is smaller than the current slot size, it will result in more slots being available therefore enabling the VM to start.
Incorrect Answers:
A: das.vmcpumaxmhz is not a valid attribute. Therefore, this answer is incorrect.
B: The das.vmcpuminmhz attribute defines the default CPU resource value assigned to a virtual machine if its CPU reservation is not specified or zero. Increasing this value would increase the CPU reservations for any VMs that do not currently have a reservation. This would result in an even larger slot size which would make the problem worse. Therefore, this answer is incorrect.
C: das. slotcpuoutmhz is not a valid attribute. Therefore, this answer is incorrect.
References:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2033248
https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.avail.doc_50%2FGUID-85D9737E-769C-40B6-AB73-F58DA1A451F0.html
