Your network contains two servers named Server1 and Server2 that run Windows Server 2012. Server1
and Server2 have the Hyper-V server role installed and are part of a host group named Group1 in
Microsoft System Center 2012 Virtual Machine Manager (VMM).
Server1 and Server2 have identical hardware, software, and settings.
You configure VMM to migrate virtual machines if the CPU utilization on a host exceeds 65 percent. The
current load on the servers is shown following table.
You start a new virtual machine on Server2 named VM8. VM8 has a CPU utilization of 20 percent.
You discover that none of the virtual machines hosted on Server2 are migrated to Server1.
You need to ensure that the virtual machines hosted on Server2 are migrated to Server1.
What should you modify from the Dynamic Optimization configuration?
A.
The Host Reserve threshold
B.
The Power Optimization threshold
C.
The Aggressiveness level
D.
The Dynamic Optimization threshold
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Here is the question with the graphic:
http://www.aiotestking.com/microsoft/what-should-you-modify-from-the-dynamic-optimization-configuration/
So, I have read a lot on this particular question. I know that the Aggressiveness Level is what determines whether the rebalancing will happen. But I don’t know that I agree with the given answer.
Before VM8 is brought online;
Server1 has total utilization at 55%.
Server2 has total utilization at 60%.
You start VM8 on Server2, which consumes 20% CPU. That makes the total utilization of CPU on Server2 80%. If VMM moves, say VM4, to Server1 it will push Server1 over the acceptable threshold to 70%. So VMM won’t move VM8 to Server1 because the threshold won’t allow it.
You need to adjust the Dynamic Optimization Thresholds for CPU in order for VMM to live migrate the VM’s as intended.
Initially I thought ‘C’ was correct, but the aggressiveness setting is to migrate VM’s to gain more resources on the hosts that are lacking. You can set the aggressiveness to High all day if you want. In this situation it won’t do anything, but sit there and look at you.
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