2V0-21.23 Question 362
Single answerYour organization uses a vSphere cluster with vSphere Cluster Services (vCLS) enabled to ensure cluster management functionality remains operational. During a scheduled maintenance window, you need to place all hosts in the cluster into maintenance mode to upgrade the hardware firmware. Which use case justifies enabling vCLS retreat mode in this scenario?
- A
To temporarily disable vCLS virtual machines to allow all hosts to enter maintenance mode without triggering alarms.
- B
To ensure vCLS virtual machines remain operational on a single host during the hardware upgrade.
- C
To prevent vCenter Server from losing access to the vSphere cluster during host maintenance.
- D
To migrate vCLS virtual machines to another cluster automatically during the maintenance period.
Show answer and explanation
Correct answer: A
Explanation
vCLS retreat mode is used in situations where all hosts in a cluster need to be placed into maintenance mode or when there are no suitable hosts available to run vCLS virtual machines. In this scenario, enabling retreat mode allows the organization to temporarily disable vCLS virtual machines, ensuring that cluster maintenance can proceed without disruption. Once the maintenance window is complete, retreat mode can be disabled to restore normal cluster services.
- A. Correct.
This is correct. Enabling vCLS retreat mode allows vCLS virtual machines to be temporarily disabled, which is necessary to ensure that no vCLS VMs block all hosts from entering maintenance mode.
- B. Incorrect.
This is incorrect. vCLS retreat mode disables vCLS virtual machines entirely; it does not ensure their operation on any host.
- C. Incorrect.
This is incorrect. vCLS is designed to maintain cluster services even if vCenter Server connectivity is lost, but enabling retreat mode removes these services temporarily.
- D. Incorrect.
This is incorrect. vCLS virtual machines do not migrate to another cluster automatically; instead, retreat mode disables them temporarily within the same cluster.