In vSphere 6.5, a virtual machine is thinly-provisioned on a VMFS6 datastore. The administrator deleted a large file within the guest OS. The freed blocks in the datastore are no l

onger needed by the VM.

Which feature in vSphere 6.5 allows the backing storage to automatically reclaim the freed blocks?

A. ATS

B. Defrag

C. UNMAP

D. Auto Reclaim

Explanation:

VAAI UNMAP was introduced in vSphere 5.0 to allow the ESXi host

to inform the backing storage that files or VMs had be moved or deleted from a Thin Provisioned VMFS datastore. This allowed the backing storage to reclaim the freed blocks. There was no way of doing this previously, resulting in many customers with a cons

iderable amount of stranded space on their Thin Provisioned VMFS datastores.