Enclosed (SAP_BW_on_HANA_Sizing_Report_V1_0) an SAP document (PDF) which describes how to predict resource (sizing) requirements for a BW system on a SAP HANA database. This document contains some explanations on how to use/run ABAP report /SDF/HANA_BW_SIZING, which precautions to take and how to interpret its outcome.