OT: SAP BW sizing

Do any of you have experience with sizing SAP BW in an Oracle environment?

If so, your experiences and inputs would be appreciated.

We were told today that we need to size servers for APO and BW.  We will 
initially
be implementing just enough BW to support APO. I don't yet know what that 
really means.

Any insights into sizing BW and APO in regards to CPU, memory and storage 
would
be most appreciated.  We have some inputs from SAP, but are leery of their 
estimates.

Thanks,

Jared

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