If E870 or E880 will be used then the following ratio is valid for BW on HANA on Power: 50 GB per Core.
Now SAP BW HANA LPARs of a maximum of 4,8 TB / 96 Cores are supported on E880 and a maximum of 4TB / 80 Cores on E870.
For E850 and S-Models 32GB per core remain valid.
For HANA Clusters, using xfs file system, currently up to 16 nodes with up to 4,8 TB each, in total up to 76,8TB for one HANA database, are supported.
Details please see SAP Note 2188482