During peak operating hours, an administrator finds that a business-critical application running a virtual machine is not performing as well as during normal hours. Which memory management method can be used to guarantee that the application performs well at all times?
A.
Set a reservation equal to the average memory utilization of the virtual machine running the application.
B.
Set the share level to high for the virtual machine running the application and set the share level for all other virtual machines to low.
C.
Set a limit equal to the peak memory utilization of the virtual machine running the application.
D.
Set the reservation equal to the configured memory of the virtual machine running the application.
Same Question 798,1206,1029.. but question 798,1206,1029 answer is D?
anybody can explain??
Correct answer D. Setting a reservation for the configured memory gurantees all possible memory for the machine is available. Setting a “limit” caps the memory.
Answer C is incorrect – a memory limit only sets a restriction on the total amount of RAM that a VM can utilize from the underlying ESXi host. It does not guarantee any additional RAM to the VM.
A reservation would have to be set equal to the assigned vRAM and also have high shares set for vRAM to allow the VM to trade shares should it need to utilize more vRAM than it has been assigned during peak periods. This option would help alleviate the performance problems but the only way to 100% guarantee performance would be to assign additional vRAM to raise the total assigned vRAM equal to that of peak usage.
If anyone has anything to add to or amend please feel free to do so.