We were considering a multiple implementation of data marts -- 11 in all -- but this has flexibility issues, so we are looking at SAP BW for a solution. Ideally, we would like have all of the organizations' data on one server (24gb) and then allocate a server to each country to hold InfoCubes on which they can run their reports, etc.
a) Separate BW license purchase
b) Very high network traffic
c) Landscape synchronization issues
These days the database engines are highly optimized at the Kernel Level. You should look at single-server installations first, along with logical and physical partitioning implemented. Multi-server data mart scenarios should only be evaluated after evaluating single-server data marts.
This was first published in November 2005