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CompTIA

CV0-003 · Question #306

IaaS users are reporting longer than expected wait times when accessing the virtual file repository. There are more than 2TB of free disk space, and vCPU and vRAM do not reach more than 75%…

The correct answer is B. Access the cloud services portal and check the amount of CPU and RAM on the host machine. When VM-level metrics appear healthy, performance issues often stem from physical host resource contention, making it necessary to examine the underlying host machine's CPU and RAM utilization.

Troubleshooting

Question

IaaS users are reporting longer than expected wait times when accessing the virtual file repository. There are more than 2TB of free disk space, and vCPU and vRAM do not reach more than 75% utilization. In which of the following ways should the cloud systems administrator analyze this issue?

Options

  • AAccess the cloud services portal and increase the amount of available disk space by 25%.
  • BAccess the cloud services portal and check the amount of CPU and RAM on the host machine.
  • CAccess the cloud services portal and look at the historical performance numbers.
  • DAccess the cloud services portal and check the security log for access denied requests.

How the community answered

(46 responses)
  • A
    2% (1)
  • B
    83% (38)
  • C
    11% (5)
  • D
    4% (2)

Why each option

When VM-level metrics appear healthy, performance issues often stem from physical host resource contention, making it necessary to examine the underlying host machine's CPU and RAM utilization.

AAccess the cloud services portal and increase the amount of available disk space by 25%.

Increasing disk space will not resolve a performance bottleneck when over 2TB of free space already exists; storage capacity is not the limiting factor.

BAccess the cloud services portal and check the amount of CPU and RAM on the host machine.Correct

Although the VM's vCPU and vRAM are under 75%, the physical host running those VMs may be oversubscribed with many tenant workloads competing for the same hardware resources. Checking the host machine's CPU and RAM through the cloud services portal can reveal hypervisor-level contention - such as CPU ready time or memory ballooning - that degrades I/O throughput for all VMs on that host, causing the longer wait times reported when accessing the virtual file repository.

CAccess the cloud services portal and look at the historical performance numbers.

Reviewing historical performance numbers is a useful investigative step but does not directly identify the root cause; it describes when the problem appeared, not what is causing it.

DAccess the cloud services portal and check the security log for access denied requests.

Checking security logs for access denied requests addresses authorization failures, not performance degradation, and is unrelated to the slow file repository access being reported.

Concept tested: Host-level resource contention analysis in IaaS environments

Source: https://learn.microsoft.com/en-us/azure/virtual-machines/monitor-vm

Topics

#performance monitoring#IaaS storage#historical metrics#resource utilization

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