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The load is high on an HA/DRS cluster. DPM is enabled. A vSphere administrator determines that hosts are NOT powering on automatically to support the load.
Which configuration would result in this condition?
A. VM-to-VM or VM-to-Host DRS rules have been configured that restrict where some VMs can be moved.
B. DPM has been set to the most Conservative threshold.
C. Some of the virtual machines have been removed from HA consideration by the vSphere administrator.
D. DRS is set to Manual Automation.
Correct Answer: D
Explanation/Reference:
Explanation:
The vSphere Distributed Power Management (DPM) feature allows a DRS cluster to reduce its power consumption by powering hosts on and off based on cluster resource utilization. vSphere DPM monitors the cumulative demand of all virtual machines in the cluster for memory and CPU resources and compares this to the total available resource capacity of all hosts in the cluster. If sufficient excess capacity is found, vSphere DPM places one or more hosts in standby mode and powers them off after migrating their virtual machines to other hosts. Conversely, when capacity is deemed to be inadequate, DRS brings hosts out of standby mode (powers them on) and uses vMotion to migrate virtual machines to them. When making these calculations, vSphere DPM considers not only current demand, but it also honors any user-specified virtual machine resource reservations.
DPM requires that DRS enabled on the cluster and is set to Fully Automated mode. This enables VMs to be vMotion migrated to other hosts in a cluster before a host can be placed into standby mode.
Incorrect Answers:
A: VM-to-VM or VM-to-Host DRS rules would not prevent DPM powering on a host. They would just restrict the movement of virtual machines affected by the rules. DPM would power on a host when it sees that available resources are running low. Therefore, this answer is incorrect.
B: Even with DPM being set to the most Conservative threshold, a host should still be powered on if the other hosts are under a high load. Therefore, this answer is incorrect.
C: Some virtual machines being removed from HA consideration by the vSphere administrator would not affect the functionality of DPM. DPM should power on a host when it sees that the load on the other hosts is high. Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/vsphere-55/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-5E5E349A-4644-4C9C-B434-1C0243EBDC80.html