While the piece points out that increasingly heavy data loads will break down functions like dialog processing and sequential memory, it also serves as a peek into what a mid-level solution could look like. The kit consisted of a PowerEdge 6850 sporting Xeon 7040s acting as host for Windows Server 2003 x64, SQL 2005 and SAP's CRM 2005. For the CRM 2005 front end, they set up a PowerEdge 2500 as client over a Gigabit Ethernet connection.
Storage consisted of a Dell/EMC CX600 with QLogic HBAs and Brocade SilkWorm Fibre Channel switches, which were zoned to include multiple logical unit numbers (LUNs) but only one HBA initiator. This allowed the EMC PowerPath software on the application server to maintain more open paths between the storage array and the requesting application, even during component failures.
The piece is long and somewhat dry, but it goes into deep technical detail for you folks who like to tear in the nitty-gritty. For the rest, it offers a look under the hood of a Dell/SAP configuration.