CompTIA
CV0-003 · Question #782
CV0-003 Question #782: Real Exam Question with Answer & Explanation
The correct answer is B: Oversubscription. Oversubscription is the direct cause of performance issues when a hypervisor platform has allocated more virtual resources than are physically available, leading to contention when VMs simultaneously demand those resources.
Troubleshooting
Question
An engineer is investigating potential performance issues in a hypervisor platform. When comparing the allocated versus actual resources, the engineer notices the platform is oversubscribed. Which of the following is MOST likely the immediate cause of the performance issues?
Options
- ADynamic allocation
- BOversubscription
- CBallooning
- DTransparent page sharing
Explanation
Oversubscription is the direct cause of performance issues when a hypervisor platform has allocated more virtual resources than are physically available, leading to contention when VMs simultaneously demand those resources.
Common mistakes.
- A. Dynamic allocation is a resource management feature that adjusts VM resource assignments based on demand; it is a technique that can help manage oversubscription, not a cause of performance issues.
- C. Ballooning is a hypervisor memory-reclamation technique that inflates a balloon driver inside a VM to recover pages when the host is under memory pressure; it is a consequence of oversubscription, not the root cause.
- D. Transparent page sharing deduplicates identical memory pages across VMs to improve effective memory capacity, which is a beneficial optimization rather than a cause of performance problems.
Concept tested. Hypervisor resource oversubscription and performance contention
Topics
#hypervisor#oversubscription#resource allocation#ballooning
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