Exam 3V0-21.21 topic 1 question 57 discussion

Changing to A and B A. Create VM-VM anti-affinity rules - A VM-VM affinity rule specifies whether selected individual virtual machines should run on the same host or be kept on separate hosts. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-94FCC204-115A-4918-9533-BFC588338ECB.html B. Set das.respectvmvmantiaffinityrules to false - Determines if vSphere HA enforces VM-VM anti-affinity rules. The default value is "true" and rules are enforced even if vSphere DRS is not enabled. In this case, vSphere HA does not fail over a virtual machine if doing so violates a rule So if we set this to false. HA will not respect the VM-VM anti-affinity rules in place and restart the machine on a host already occupied by one of the DB nodes. I guess this is where operational resiliency in the question comes into play.

A,B sounds better: das.respectvmvmantiaffinityrules Determines if vSphere HA enforces VM-VM anti-affinity rules. The default value is "true" and rules are enforced even if vSphere DRS is not enabled. In this case, vSphere HA does not fail over a virtual machine if doing so violates a rule, but it issues an event reporting there are insufficient resources to perform the failover. This option can also be set to "false", whereby the rules are not enforced.

A : This will ensure the datastore cluster’s nodes will run on different hosts, avoiding a SPOF B : This will get around the VM-VM anti-affinity, and will force vSphere HA to restart a lost database cluster’s node even if there is not enough hosts available. C : It could be a manual method to force a database server to run on each host, but it is not very flexible. D : if DRS is running, the VM-VM anti-affinity rule will not allow to move a VM anyway, and the host will not enter in maintenance. E: won’t help in anything

It's A and B. A. You need an Anti-Affinity rule to keep all VMs separated and comply with Node Majority cluster service requirement. B. By letting the cluster ignore the Anti-Affinity rule under certain circumstances ((like putting a Host into Maintenance Mode), we are allowing a VM to be migrated to another Host, thus avoiding an availability impact.

A & B will be the correct answer. see for more information the post of nemisis95

C & D for me. C. Create VM-Host anti-affinity rules D. Disable vSphere HA during maintenance

AB would be contradiction. Correct answer is BC

I'd say A and B