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CV0-003 · Question #486

A company has an internal SLA for CPU and RAM oversubscription that should stay below 120%. Storage utilization should stay below 90% with oversubscription below 160%. Given the following: Which of th

The correct answer is D. Add CPU and RAM to the cluster. When both CPU and RAM oversubscription ratios exceed the SLA threshold of 120%, the correct remediation is to add both CPU and RAM to the physical cluster to reduce both ratios simultaneously.

Operations

Question

A company has an internal SLA for CPU and RAM oversubscription that should stay below 120%. Storage utilization should stay below 90% with oversubscription below 160%. Given the following:

Which of the following should be done to meet the SLA?

Options

  • AInstall a different hypervisor
  • BAdd RAM to the hypervisors and new shelves to the storage array
  • CAdd RAM to the hypervisors and increase the CPU clock
  • DAdd CPU and RAM to the cluster

How the community answered

(35 responses)
  • A
    3% (1)
  • B
    6% (2)
  • C
    14% (5)
  • D
    77% (27)

Why each option

When both CPU and RAM oversubscription ratios exceed the SLA threshold of 120%, the correct remediation is to add both CPU and RAM to the physical cluster to reduce both ratios simultaneously.

AInstall a different hypervisor

Changing the hypervisor does not add physical CPU or RAM capacity, so oversubscription ratios remain unchanged and SLA compliance is not achieved.

BAdd RAM to the hypervisors and new shelves to the storage array

Adding only RAM and storage shelves does not address a CPU oversubscription violation, leaving the CPU SLA threshold potentially unmet.

CAdd RAM to the hypervisors and increase the CPU clock

Increasing CPU clock speed improves per-core performance but does not add logical CPU count, so the oversubscription ratio calculated on core or thread count is not reduced.

DAdd CPU and RAM to the clusterCorrect

Oversubscription ratios are calculated by dividing total allocated virtual resources by available physical capacity; the only way to lower both CPU and RAM ratios is to increase the physical resource pool by adding CPUs and RAM directly to the cluster. Adding capacity proportionally brings both metrics below the 120% SLA threshold without requiring reconfiguration of virtual workloads or hypervisor replacement.

Concept tested: Remediating CPU and RAM oversubscription SLA violations in a cluster

Source: https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-resource-management/GUID-98BD5A8A-260A-494F-BAAE-74781F5C4B02.html

Topics

#oversubscription#SLA compliance#capacity planning#hypervisor resources

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