Using vSphere HA Orchestrated Restart an administrator places the most mission critical VM in the highest priority. After a host failure, the highest priority VM fails to restart while VMs in high priority restart. What would cause this to occur?
A.
There are insufficient cluster resources.
B.
Performance degradation VMs tolerate threshold is at default.
VM restart priority determines the relative order in which virtual machines are placed on new hosts after a host failure. Such virtual machines are restarted, with the highest priority virtual machines attempted first and continuing to those with lower priority until all virtual machines are restarted or no more cluster resources are available. Note that if vSphere HA fails to power on a high-priority virtual machine, it does proceed to try any lower-priority virtual machines. Because of this, the VM restart priority cannot be used to enforce a restart priority for a multiple virtual machine application. Also, if the number of hosts failures exceeds what admission control permits, the virtual machines with lower priority might not be restarted until more resources become available. Virtual machines are restarted on the failover hosts, if specified.
a host failure, vMotion and svMotion could not happen anymore, so the DRS could not restart VM. Only proactive HA can give the VM has a chance to restart, since proactive HA will monitor/predict the resource or failure, and trigger action before the Host failed.
VM restart priority determines the relative order in which virtual machines are placed on new hosts after a host failure. Such virtual machines are restarted, with the highest priority virtual machines attempted first and continuing to those with lower priority until all virtual machines are restarted or no more cluster resources are available. Note that if vSphere HA fails to power on a high-priority virtual machine, it does proceed to try any lower-priority virtual machines.
so A might be the answer.
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