What are the pros/cons of having 1 large BI system versus 2 medium systems?

What are the pros/cons of having 1 large BI system versus 2 medium systems?  Are there any known limits as to how large a BI system can be until it experiences performance problems?
Thanks!

Hi,
I dont think there is any limit as long as your DB and Apps servers support it.
There are case studies on systems from 20 TB to 60 TB.
Regarding having two meduim installations it may not be a right choice if you consider facts like routine maintenance, DB upgrades and reorganization, number of resources required, number of DEV and QUAL servers required (this will increase as each PROD requires one DEV and one QUAL atleast).
If you have a single PROD you can do away with this.
One DEV , one QUAL and a single team of dedicated resources are required to maintain the system.
Try this Help files.
Large Data Warehouse Implementations
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/c04aa1fe-0fa2-2a10-b78f-be514604d3eb
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/media/uuid/dcd29c7a-0701-0010-ceb3-8ac3918f1ac7
Experiences with SAP NetWeaver® Business Intelligence at 20 Terabytes
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/406a36d7-99b0-2a10-8b89-f91b4a020bd2
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/d56bbf90-0201-0010-53aa-923512127968
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/80d636a9-2dc1-2a10-42a3-ac0b8eac5dc0
Infrastructure Solutions Design, Manage and Optimize a 60 TB SAP NetWeaver Business Intelligence data
warehouse
http://www.redbooks.ibm.com/redpieces/pdfs/sg247289.pdf
http://www.sap.com/platform/esoa/pdf/CS_NetWeaver_Case_Studies.pdf
Hope this helps.
Thanks,
JituK

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