VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

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Which condition would cause a local flash device to be unavailable for use with Virtual SAN?

It is in use by the vFlash Read Cache feature.
It has no partitions created.
It is larger than the minimum capacity required.
It has a VMFS datastore present.

The correct answer is: It is in use by the vFlash Read Cache feature.

A local flash device becomes unavailable for use with Virtual SAN when it is being utilized by the vFlash Read Cache feature. This is because the vFlash Read Cache is designed to accelerate reads for virtual machines by using local flash storage, thereby effectively locking that device's use for other purposes within the environment, including being part of the Virtual SAN storage solution. In contrast, while having no partitions created could potentially make a device less useful, it does not outright make it unavailable. Additionally, if a device exceeds the minimum capacity requirement, it still remains valid for use. Lastly, the presence of a VMFS datastore might complicate its use or require certain steps to repurpose it for Virtual SAN, but does not render the device completely unavailable. Thus, the condition causing unavailability is specifically linked to its active engagement with the vFlash Read Cache, clarifying why that option stands out.