Dell Unity Advanced Deduplication is a data reduction feature available only for block storage resources within an All-Flash Pool. A fundamental requirement for enabling deduplication on a storage object is that it must be thin-provisioned. Therefore, deduplication is supported on Thin LUNs and on block-based datastores created on Thin LUNs, such as VMFS datastores. Thick LUNs and file-level storage (NFS/SMB) do not support this feature.

A. Vols and Thick LUNs: "Vols" typically refers to file-level vVols, which do not support deduplication. Thick LUNs are explicitly not supported for deduplication.

C. VMFS datastores and vVols: While deduplication is supported on VMFS datastores (on thin LUNs) and block vVols, this option is less precise than B, which correctly specifies the "thin" nature of the supported objects.

D. Thin LUNs and thick LUNs: This is incorrect because deduplication is not supported on thick-provisioned LUNs, as their space is fully allocated at creation.

1. Dell Unity: Data Reduction (White Paper)

Page 10: "Deduplication is a block-level feature that is only available on All Flash Pools. Deduplication is supported on Thin LUNs

Consistency Groups

and VMFS Datastores."

2. Dell Unity: Best Practices Guide (Technical White Paper)

Page 16: "Data reduction is supported on block storage resources (LUNs and VMFS datastores) in an all-flash pool... The storage resource must be thin for data reduction to be enabled."