2V0-621D · Question #252
An administrator has configured Network I/O Control to support bandwidth allocation to a group of virtual machines running on a vSphere 6.x HA/DRS Cluster. Which two conditions would cause DRS to…
The correct answer is A. The reservation is changed to a value that the initial host can no longer satisfy. B. A physical adapter that carries traffic from the virtual machine is offline. DRS migrates virtual machines to maintain performance and resource availability. It triggers if a VM's resource reservation can no longer be met on its current host or if a critical network component, such as a physical adapter serving the VM, becomes unavailable.
Question
An administrator has configured Network I/O Control to support bandwidth allocation to a group of virtual machines running on a vSphere 6.x HA/DRS Cluster. Which two conditions would cause DRS to migrate one of these virtual machines to another host in the cluster? (Choose two.)
Options
- AThe reservation is changed to a value that the initial host can no longer satisfy.
- BA physical adapter that carries traffic from the virtual machine is offline.
- CA physical adapter cannot supply the minimum bandwidth in accordance with the teaming
- DA reservation for a VM network adapter is less than the free quota in the network resource
How the community answered
(33 responses)- A82% (27)
- C6% (2)
- D12% (4)
Why each option
DRS migrates virtual machines to maintain performance and resource availability. It triggers if a VM's resource reservation can no longer be met on its current host or if a critical network component, such as a physical adapter serving the VM, becomes unavailable.
If a VM's resource reservation (CPU, memory, or network I/O) is increased beyond what the current host can guarantee, DRS will identify another host in the cluster that has sufficient unreserved capacity to satisfy the new reservation and migrate the VM to it, ensuring guaranteed resources.
When a physical network adapter carrying a virtual machine's traffic goes offline, it can severely degrade or completely disrupt the VM's network connectivity and performance. DRS, recognizing this host hardware issue impacting VM availability or resource access, may trigger a migration to a host where network resources are fully operational.
Cannot supply the minimum bandwidth in accordance with the teaming refers to a potential performance bottleneck or degraded service, not necessarily a hard failure or a violation of a reservation that would directly trigger DRS.
The statement A reservation for a VM network adapter is less than the free quota in the network resource indicates that there is more free network quota than the VM's reservation, meaning the reservation is easily satisfied, and this condition would not cause DRS to migrate a virtual machine.
Concept tested: vSphere DRS migration triggers for resource availability and host health
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-B05F1976-C581-4F20-91B6-7C383F66A6B7.html
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