2V0-622D · Question #41
When operating with Distributed Resource Scheduler (DRS) and Distributed Power Management (DPM), what two statements explain the impact of disabling vSphere High Availability admission control? (Choos
The correct answer is C. DRS will evacuate virtual machines from hosts and places hosts in maintenance or standby D. VMware DPM will place hosts in standby mode even if doing so violates failover requirements.. Disabling vSphere HA admission control removes the policy enforcement that normally prevents DRS and DPM from reducing available failover capacity. Without that guard, DRS freely evacuates hosts for standby placement and DPM powers down hosts regardless of failover impact.
Question
When operating with Distributed Resource Scheduler (DRS) and Distributed Power Management (DPM), what two statements explain the impact of disabling vSphere High Availability admission control? (Choose two.)
Options
- AVMware DPM does not place hosts in standby mode if doing so would violate failover
- BDRS does not evacuate virtual machines from a host for the purpose of placing it in maintenance
- CDRS will evacuate virtual machines from hosts and places hosts in maintenance or standby
- DVMware DPM will place hosts in standby mode even if doing so violates failover requirements.
How the community answered
(25 responses)- A12% (3)
- B28% (7)
- C60% (15)
Why each option
Disabling vSphere HA admission control removes the policy enforcement that normally prevents DRS and DPM from reducing available failover capacity. Without that guard, DRS freely evacuates hosts for standby placement and DPM powers down hosts regardless of failover impact.
This statement describes behavior when HA admission control IS enabled - with an active admission control policy, DPM respects the failover capacity reservation and will not place a host in standby if it would violate that reservation.
This describes behavior when HA admission control IS enabled - admission control prevents DRS from reducing available host capacity below failover thresholds, which includes blocking VM evacuations intended to power down hosts.
When HA admission control is disabled, DRS is no longer restricted from lowering available cluster capacity below any failover threshold, so it will fully evacuate virtual machines from a host and then allow DPM to place that host into maintenance or standby mode for power savings. This cooperative behavior between DRS and DPM is specifically what admission control gates when it is enabled.
With admission control disabled there is no enforcement mechanism to prevent DPM from powering down hosts even when doing so would leave the cluster unable to tolerate the configured number of host failures. DPM relies on admission control checks to honor failover requirements, so disabling admission control removes that constraint entirely.
Concept tested: HA admission control impact on DRS and DPM host standby behavior
Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.avail.doc/GUID-C26A4F79-5F43-4576-A35E-F9BD1C0D4E4F.html
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