NCP-MCI-6.10 · Question #48
An administrator notices high CPU usage on a VM and wants to determine whether adding more vCPUs would improve performance. Which two metrics should be analyzed to make this decision? (Choose two.)
The correct answer is A. VM CPU Ready Time B. VM CPU Usage. Two VM-level CPU metrics together tell you definitively whether more vCPUs will help: (1) VM CPU Usage - if consistently at or near 100%, the VM is CPU-bound and is using all its allocated vCPUs; (2) VM CPU Ready Time - measures how long the VM is waiting in queue for a…
Question
An administrator notices high CPU usage on a VM and wants to determine whether adding more vCPUs would improve performance. Which two metrics should be analyzed to make this decision? (Choose two.)
Options
- AVM CPU Ready Time
- BVM CPU Usage
- CHost CPU Usage
- DHost Memory Swap Out Rate
How the community answered
(31 responses)- A77% (24)
- C16% (5)
- D6% (2)
Explanation
Two VM-level CPU metrics together tell you definitively whether more vCPUs will help: (1) VM CPU Usage - if consistently at or near 100%, the VM is CPU-bound and is using all its allocated vCPUs; (2) VM CPU Ready Time - measures how long the VM is waiting in queue for a physical CPU to become available. High ready time indicates CPU contention; the VM wants CPU cycles but cannot get them. Together: high usage + high ready time = strong case for more vCPUs. Host CPU Usage (C) reflects cluster-level pressure but does not isolate whether this specific VM needs more vCPUs - the host may be busy with other workloads. Host Memory Swap Out Rate (D) is a memory metric unrelated to CPU sizing decisions.
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