What is thin provisioning in ONTAP?

• A. Thin provisioning allows FlexVols to appear larger to clients than they actually use, with space allocated on-demand.
• B. Thin provisioning preallocates all space for volumes.
• C. Thin provisioning duplicates data across volumes.
• D. Thin provisioning increases IOPS.

Answer: (A)

Thin provisioning is a method where storage is made to look larger to hosts than the physical space actually allocated. In ONTAP, FlexVols can be configured as thinly provisioned, so space is assigned from the underlying pool only when data is written. This means a volume can present a large capacity to clients, but the actual physical blocks are allocated on-demand as data grows. If only a portion of the volume is used, the unused space remains unallocated until needed, enabling efficient overcommitment and better utilization of storage.

This matches the chosen option because it describes the on-demand allocation and the perception of larger capacity than is currently used. The other statements describe thick provisioning (preallocating all space), data duplication across volumes, or performance changes, none of which define thin provisioning.