ISC2 Certified Cloud Security Professional (CCSP) Practice Question
During a weekly performance review of your production IaaS cluster, several Linux web-service VMs appear almost idle from inside the guest (CPU utilization <10 %), yet customer transactions are completing nearly twice as slowly as usual. Historical monitoring dashboards show no guest-level memory pressure and only moderate network usage. To determine whether the issue is caused by resource contention at the virtualization layer, which additional hypervisor-level metric should you examine first?
TCP retransmission count on the virtual network adapter
Guest kernel context switch rate
CPU ready time for each vCPU
Average disk queue length reported by the guest OS
CPU ready time is measured by the hypervisor and represents the cumulative time a virtual CPU spends ready to run but unable to be scheduled on a physical core. When CPU ready is high, a VM can show low guest CPU utilization even though it is actually waiting to execute, resulting in application slowdowns and increased response times. Guest kernel context switches and disk queue length are internal guest metrics that would already appear in the operating system's performance tools and have been ruled out. TCP retransmissions measure network reliability rather than CPU scheduling delays. Therefore, examining CPU ready time is the most effective next step to confirm whether host-level CPU contention is causing the observed latency.
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ISC2 Certified Cloud Security Professional (CCSP)
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