2V0-21.23 Question 42
Single answerAn administrator is managing a cluster with VMware Distributed Resource Scheduler (DRS) enabled. Several virtual machines (VMs) are experiencing performance issues due to resource contention. The administrator notices that despite the contention, no VMs are being migrated to other hosts in the cluster. What could be the most likely reason for this behavior?
- A
The DRS automation level is set to Manual.
- B
The cluster is in maintenance mode, preventing DRS operations.
- C
The hosts in the cluster do not have sufficient available resources for migration.
- D
The virtual machines are configured with affinity rules that prevent migration.
Show answer and explanation
Correct answer: C
Explanation
In this scenario, the most likely cause of the behavior is that the hosts in the cluster do not have sufficient available resources for DRS to migrate the virtual machines. DRS evaluates both the source and destination hosts to ensure that resource requirements are met during migration. If no host in the cluster can provide adequate resources, DRS will not perform the migration, even if there is resource contention. Other options, such as the automation level or affinity rules, would impact the migration process differently, but they are not the most plausible explanation for this specific situation.
- A. Incorrect.
If the DRS automation level is set to Manual, DRS will still generate recommendations for migrations, but an administrator would need to approve them. This doesn’t prevent migration but requires manual intervention.
- B. Incorrect.
A cluster being in maintenance mode would not allow virtual machines to run on it, so this is not likely the reason for the lack of migration.
- C. Correct.
If hosts in the cluster do not have sufficient available resources, DRS will not migrate virtual machines, as there is no destination host that can accommodate the VMs’ resource needs. This is the most likely reason in this scenario.
- D. Incorrect.
Affinity rules may restrict migration of specific VMs, but this is not mentioned as a factor in the scenario provided, so it is less likely to be the cause.