2V0-21.23 Question 35
Single answerAn administrator is managing a virtualized environment where multiple virtual machines (VMs) share the same datastore. The administrator notices performance degradation on the datastore when one VM starts running a high I/O workload. How can Storage I/O Control (SIOC) help in this scenario?
- A
It limits the IOPS of all virtual machines on the datastore to ensure fair resource allocation.
- B
It dynamically adjusts the IOPS for virtual machines based on predefined shares and the datastore's latency threshold.
- C
It moves high I/O workloads to a separate datastore automatically without user intervention.
- D
It reserves storage bandwidth for critical virtual machines, ensuring performance consistency.
Show answer and explanation
Correct answer: B
Explanation
Storage I/O Control (SIOC) is a feature that monitors datastore latency and dynamically adjusts the IOPS for virtual machines sharing the datastore. It uses the share-based prioritization model to ensure that higher-priority VMs receive appropriate resources during periods of high I/O contention. In this scenario, enabling SIOC allows the administrator to mitigate performance degradation by dynamically redistributing I/O resources based on the VMs' share settings and the datastore's latency threshold.
- A. Incorrect.
This is incorrect because SIOC does not indiscriminately limit the IOPS of all VMs. Instead, it adjusts IOPS dynamically based on priorities and latency thresholds.
- B. Correct.
This is correct because SIOC monitors the datastore's latency and dynamically adjusts the IOPS for VMs based on their configured shares, ensuring fair resource allocation and reducing performance bottlenecks.
- C. Incorrect.
This is incorrect because SIOC does not move workloads between datastores automatically. It works at the datastore level by managing I/O prioritization.
- D. Incorrect.
This is incorrect because SIOC does not reserve storage bandwidth. Instead, it uses share-based prioritization to allocate resources dynamically when contention occurs.