CV0-003 · Question #271
A new private cloud platform is being deployed by an engineer. SLA requirements state that any clusters should have a baseline redundancy sufficient to handle the failure of at least two hosts. The…
The correct answer is D. Disk utilization. This question tests understanding of N+2 cluster redundancy and which resource metric is most likely to violate an SLA requiring tolerance of two simultaneous host failures.
Question
A new private cloud platform is being deployed by an engineer. SLA requirements state that any clusters should have a baseline redundancy sufficient to handle the failure of at least two hosts. The engineer records the following metrics after the deployment:
Which of the following metrics is MOST likely to represent a violation of SLA?
Exhibit
Options
- ARAM utilization
- BNIC utilization
- CCPU utilization
- DDisk utilization
How the community answered
(18 responses)- A6% (1)
- B22% (4)
- C11% (2)
- D61% (11)
Why each option
This question tests understanding of N+2 cluster redundancy and which resource metric is most likely to violate an SLA requiring tolerance of two simultaneous host failures.
RAM utilization can often be managed through memory ballooning and overcommitment in hypervisor environments, making it less likely to be the hard SLA boundary.
NIC utilization can be redistributed across virtual switches and bonded interfaces when hosts fail, reducing the likelihood of it being the binding constraint.
CPU utilization is typically overcommittable in virtualized environments and schedulers can rebalance vCPU workloads across surviving hosts without hard capacity violations.
Disk utilization is the most likely SLA violation because storage capacity is a fixed, non-elastic resource in most cluster configurations. If aggregate disk utilization across the cluster does not leave sufficient headroom for the workloads of two failed hosts to be absorbed by the remaining nodes, the N+2 redundancy requirement is breached. Unlike CPU or RAM, disk cannot be dynamically overcommitted or live-migrated in the same way during host failure.
Concept tested: N+2 cluster redundancy and storage capacity SLA compliance
Source: https://learn.microsoft.com/en-us/azure-stack/hci/concepts/fault-tolerance
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