2V0-622 · Question #515
When vSphere Flash Read Cache is assigned to a virtual machine, which statement is true?
The correct answer is B. A virtual RDM can be used with this virtual machine.. vSphere Flash Read Cache has specific compatibility constraints; virtual RDMs are supported but several other features and hardware versions are not.
Question
When vSphere Flash Read Cache is assigned to a virtual machine, which statement is true?
Options
- AvSphere Fault Tolerance can be used with this virtual machine
- BA virtual RDM can be used with this virtual machine.
- CPhysical RDM can be used with this virtual machine.
- DThis virtual machine must use virtual hardware version 9 or above.
How the community answered
(35 responses)- A3% (1)
- B91% (32)
- D6% (2)
Why each option
vSphere Flash Read Cache has specific compatibility constraints; virtual RDMs are supported but several other features and hardware versions are not.
vSphere Fault Tolerance is explicitly incompatible with Flash Read Cache; a VM cannot have both FT enabled and a vFlash reservation configured simultaneously.
Virtual RDM (virtual compatibility mode) is supported with vSphere Flash Read Cache because it presents storage as a virtual disk that vFlash can cache. Physical RDMs and certain features like FT are excluded, but virtual RDMs remain a valid storage configuration alongside vFlash.
Physical RDM (physical compatibility mode) is not supported with vSphere Flash Read Cache; only virtual compatibility mode RDMs are permitted.
vSphere Flash Read Cache requires virtual hardware version 10 or higher, not version 9, so a VM on hardware version 9 cannot use vFlash.
Concept tested: vSphere Flash Read Cache VM compatibility requirements
Source: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-ECFBF6F2-9A44-4DB0-84A8-15878C764F67.html
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