VMware App Volumes 4 Specialist — Question 2

An All-Flash vSAN cluster has 4 nodes with this disk group composition on each host:
✑ 1 × 800 GB SAS SSD
✑ 6 × 3.84 TB SATA SSD
An administrator observes that in an All-Flash cluster, the Write Buffer Free Percentage is consistently low. As a result, there is increased latency experienced by the workloads.
Which remediation steps will resolve this issue?

Answer options

• A. Add a second disk group with a new cache device and distribute the capacity disks equally.
• B. Add a second cache device to the same disk group to increase the caching size.
• C. Modify advanced vSAN configuration parameters to utilize the complete 800 GB for caching.
• D. Replace the existing cache device with a larger cache device.

Correct answer: A

Explanation

Adding a second disk group with a new cache device and distributing capacity disks evenly (Option A) will effectively improve the Write Buffer Free Percentage by balancing the workload across multiple cache devices. Option B, which suggests adding another cache device to the same disk group, may not resolve the underlying issue of capacity distribution. Option C is not advisable as it could lead to inefficient cache utilization. Option D may provide temporary relief but does not address the need for better capacity management across the cluster.