2V0-21.23 Question 34
Select 2A vSphere administrator is managing a cluster with multiple virtual machines and shared datastores. They notice that during peak workload periods, some virtual machines are experiencing storage latency issues. To address this, the administrator enables Storage I/O Control (SIOC) on the datastores. Which of the following statements describe how SIOC operates in this scenario?
- A
SIOC monitors the latency of the datastore and throttles I/O for virtual machines consuming excessive resources.
- B
SIOC ensures that all virtual machines have equal storage I/O access regardless of their configured shares.
- C
SIOC requires the use of vSphere Storage DRS to function properly.
- D
SIOC prioritizes I/O requests based on the share values assigned to virtual machines or virtual disks.
- E
SIOC can be configured to enforce specific IOPS limits at the datastore level.
Show answer and explanation
Correct answers: A, D
Explanation
Storage I/O Control (SIOC) is designed to address storage performance issues in environments with shared datastores by monitoring latency and dynamically adjusting I/O access. It prioritizes I/O requests based on share values assigned to virtual machines or virtual disks, ensuring that critical workloads receive sufficient resources during contention periods. SIOC operates independently and does not require vSphere Storage DRS or enforce static IOPS limits at the datastore level.
- A. Correct.
Correct: SIOC monitors datastore latency and dynamically adjusts I/O access for virtual machines consuming excessive resources to prevent performance degradation for other VMs.
- B. Incorrect.
Incorrect: SIOC does not ensure equal access; it prioritizes I/O based on the share values configured for each VM or virtual disk.
- C. Incorrect.
Incorrect: SIOC does not require vSphere Storage DRS to function. It operates independently to monitor and control I/O on shared datastores.
- D. Correct.
Correct: SIOC uses the share values assigned to virtual machines or virtual disks to prioritize I/O requests during periods of contention.
- E. Incorrect.
Incorrect: SIOC does not enforce specific IOPS limits at the datastore level. Instead, it dynamically adjusts I/O access based on latency thresholds and resource contention.