There are so few information about very various theme as HANA table placement and table distribution.
In SPS 06 and later
answer from SAP Support:
By default when BW creates a DSO table it sends an estimated row count of 1 Mio. records.
As according to the table placement rules a DSO tableis created with 3 parts if it exceeds 40 Mio. records (which is not
fullfilled) the table is created with one part.
Sap notes: 1908073 1908075 1908082 1908133
My question to SAP - does it' mean that we have always all tables on one node and other will be idle.
Answer from SAP - Different DSO tables will usually be placed on different slave nodes (depending on the hash value of the group
name).
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So Be aware that for default in your Scale-out BW on HANA systems DSOs tables will be created on one worker node and without any partitions.