A Nutanix cluster is equipped with four nodes. Four VMs on this cluster have been configured with a VM-VM anti-affinity policy and are each being hosted by a different node. What occurs to the cluster and these VMs during an AHV upgrade?
A.
One VM out of the four powers down when the node hosting it reboots
B.
The AHV pre-upgrade checks fail until the four VMs are powered off
C.
The AHV pre-upgrade checks fail until the administrator disables the anti-affinity policy
D.
One node hosts two VMs while the node being upgraded is in maintenance mode
I believe the answer is D. The below statement from Prism 6.5 guide says the policy does not limit ADS feature which to me says ADS will do the needful and move the VM to the host best suited to handle the workload.
https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v6_5:ahv-vm-anti-affinity-t.html
After you configure the group and then power on the VMs, the VMs that are part of the group are started (attempt to start) on the different hosts. However, this is a preferential policy. This policy does not limit the Acropolis Dynamic Scheduling (ADS) feature to take necessary action in case of resource constraints.
it should not be C, as the vm-vm anti-affinity policy only applies when the specified virtual machines apart in such a way that when a problem occurs with one host, you should not lose both the virtual machines.
here we just have 1 vm on the one host/node. So, no chance of disabling the vm-vm anti-affinity policy.
Option D sounds reasonable answer.
D is correct answer. The question here just refers to VM-VM Anty Affinity in AHV upgrade scenario, VM-Host Affinity is not applied. So there is no AHV pre-check failing and no ungraceful poweroff
https://portal.nutanix.com/page/documents/details?targetId=Acropolis-Upgrade-Guide-v5_20:upg-hypervisor-upgrade-ahv-c.html
Guest VMs Running in an Affinity/Anti-Affinity Rules Environment
Hypervisor upgrades might not complete successfully in environments where third-party or other applications apply affinity or anti-affinity rules. For example, some antivirus appliances or architectures might install an antivirus scanning guest VM on each node in your cluster. This guest VM might not be allowed to power off or migrate from the host being upgraded, causing maintenance mode to time out. In this case, disable such rules or power off such VMs before upgrading.
https://portal.nutanix.com/page/documents/details?targetId=Acropolis-Upgrade-Guide-v5_20:upg-hypervisor-upgrade-recommend-c.html
Should be D for me. In MCI Training course, stated that ADS takes necessary actions in case of resource contraints, maintenance mode or HA. Is like "should run on" in VMware environments
Yeah, but this is talking about an upgrade not resource contention.
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