Scaling is key :-)) !

Now really large OLTP S/4HANA implementations are supported:
up to 128 TB (Scale-Out 4 nodes with each 32 TB) – on prem
and up to 4 nodes with 30.5 TB each on Power Virtual Server!

For details please have a look into SAP Note 2188482:
https://me.sap.com/notes/2188482