1Y0-401 · Question #373
Why should CPU consumption above 85% be used to identify bottlenecks?
The correct answer is A. At least 20% of resources should be available at all times. A CPU consumption threshold above 85% is used to identify bottlenecks because it ensures that sufficient processing headroom remains available for handling peak loads and unexpected system overhead.
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Options
- AAt least 20% of resources should be available at all times.
- BXenServer host CPU utilization above 90% causes excessive paging.
- CXenServer host reserves 20% of all memory for paging.
- DRunning XenCenter will consume 20% of all memory resources.
How the community answered
(42 responses)- A95% (40)
- B2% (1)
- D2% (1)
Why each option
A CPU consumption threshold above 85% is used to identify bottlenecks because it ensures that sufficient processing headroom remains available for handling peak loads and unexpected system overhead.
Maintaining at least 20% of CPU resources available serves as a critical buffer, allowing the system to handle unexpected spikes in demand and preventing performance degradation or unresponsiveness that can occur when CPU utilization consistently approaches 100%.
While high CPU utilization on a hypervisor can have various negative effects, associating 90% CPU specifically with excessive paging is not a universally accurate or primary reason for the 85% bottleneck threshold for any CPU.
XenServer host reserving 20% of memory for paging is a specific hypervisor configuration detail, not a general reason for a CPU consumption threshold on guest VMs or hosts.
Running XenCenter consuming 20% of memory resources is a specific application's resource usage and not a general best practice for setting a CPU bottleneck threshold.
Concept tested: CPU utilization capacity planning
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