CV0-003 · Question #160
An administrator is responsible for managing a private cloud that has servers that require a significant amount of RAM, but does not have the resources to dedicate to the guests. Which of the…
The correct answer is B. Memory reservation. Memory reservation guarantees a minimum amount of physical RAM to a VM on a hypervisor, ensuring critical workloads receive the memory they need without requiring full static allocation.
Question
An administrator is responsible for managing a private cloud that has servers that require a significant amount of RAM, but does not have the resources to dedicate to the guests. Which of the following features should the administrator configure on the hypervisor?
Options
- AResource pooled memory
- BMemory reservation
- CDynamic memory
- DStatic memory
How the community answered
(26 responses)- B96% (25)
- D4% (1)
Why each option
Memory reservation guarantees a minimum amount of physical RAM to a VM on a hypervisor, ensuring critical workloads receive the memory they need without requiring full static allocation.
Resource pooled memory aggregates memory across multiple hosts for collective scheduling, but does not provide a per-VM guaranteed minimum allocation for high-priority workloads.
Memory reservation sets a guaranteed floor of physical RAM that the hypervisor will always keep available for a specific VM, preventing memory ballooning or swapping from degrading it even when the host is under pressure. This is the correct choice when VMs require significant RAM but the host cannot afford to dedicate the full physical memory statically to every guest. It balances guaranteed performance with efficient host resource use by releasing unneeded reserved memory back to the pool.
Dynamic memory allows the hypervisor to scale RAM allocations up or down at runtime based on workload demand, but does not guarantee a reserved minimum amount for VMs with critical memory requirements.
Static memory assigns a fixed, unchanging amount of RAM permanently to a VM, which is not feasible when the host lacks the physical capacity to fully dedicate memory to all guests simultaneously.
Concept tested: Hypervisor memory reservation for guaranteed VM allocation
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-00B58E19-2B6C-46D4-B741-56E83D4CE7C7.html
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