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CompTIA Tech+ (FC0-U71)InfrastructureHard

A technician is configuring a new virtual machine (VM) for a critical application. The application requires dedicated and consistent performance, particularly for CPU and memory resources, and should not be affected by the resource demands of other VMs on the same physical host. Which virtualization resource allocation setting should the technician prioritize?

  1. ADynamic allocation
  2. BResource pooling
  3. CBallooning
  4. DResource reservation
Show answer & explanation

Correct answer: D. Resource reservation

Resource reservation guarantees a specific amount of CPU, memory, or storage resources to a VM, ensuring that these resources are always available to the VM regardless of the load on the physical host or the demands of other VMs. This is crucial for critical applications requiring consistent performance.

Why the other options are wrong

  • A. Dynamic allocation (or overcommitment) allows resources to be shared and allocated on demand, which is efficient but does not guarantee consistent performance for a critical VM.
  • B. Resource pooling groups physical resources, allowing VMs to draw from a shared pool, but doesn't guarantee a minimum for a specific VM.
  • C. Ballooning is a memory management technique where the hypervisor reclaims unused memory from a VM, which is the opposite of guaranteeing dedicated resources.

Virtual Machine Resource Reservation

A virtualization setting that guarantees a minimum amount of CPU, memory, or storage resources to a specific virtual machine, ensuring consistent performance regardless of host load.

  • Allocates resources exclusively to a VM.
  • Prevents resource contention with other VMs.
  • Essential for performance-critical applications.
  • Reduces the flexibility of resource overcommitment.

Memory trick: Reservation ensures VIP performance, no resource starvation.

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