CompTIA DataSys+ (DS0-001)Database DeploymentEasy
A database administrator is planning the deployment of a new PostgreSQL database on a virtual machine. To ensure consistent performance and prevent resource contention with other VMs on the same host, the administrator needs to reserve a specific amount of CPU and memory for the database VM. Which virtualization concept is being applied here?
- AMemory ballooning
- BCPU overcommitment
- CDynamic resource scheduling
- DResource reservation
Show answer & explanationAnswer & explanation
Correct answer: D. Resource reservation
Resource reservation in virtualization ensures that a specific minimum amount of CPU, memory, or other resources is always available to a particular virtual machine, preventing other VMs from consuming those resources and guaranteeing consistent performance for critical applications.
Why the other options are wrong
- A. Memory ballooning is a technique used by hypervisors to reclaim unused memory from a VM, which is the opposite of reserving resources.
- B. CPU overcommitment allows allocating more CPU resources than physically available, which can lead to contention, not consistent performance.
- C. Dynamic resource scheduling manages resource allocation dynamically but does not guarantee a minimum reservation, potentially leading to performance fluctuations.
Virtual Machine Resource Reservation
A virtualization setting that guarantees a minimum amount of CPU, memory, or other resources to a specific virtual machine, ensuring consistent performance regardless of host load.
- Guarantees a minimum resource allocation.
- Prevents resource contention.
- Crucial for performance-sensitive applications.
- Reduces flexibility for other VMs on the host.
Memory trick: VM resources: Share, steal, or secure.