Operating Environment and Scalability

In developing any commercial system, it is essential to develop a scaled roadmap that allows validation of the service architecture in a lab or prototype phase, with a simple way to scale up to an initial commercial presence. Once this model is running, you can gradually meet increasing service loads, by separating functionality across computers, almost without limit. The following two-server configuration is quite capable of prototyping all of the functionality described here. A commercial deployment would separate functionality as described in a later chapter.

Hardware

Installed Software

Gateway Server

Single-Processor 1+ GHz
500 MB RAM
40 GB mirrored IDE (RAID 0) hard drive

Windows 2000 with latest service pack

Internet Security and Acceleration (ISA) Server

Small Space Server

Dual-Processor 2 GHz
4 GB RAM
100 GB mirrored IDE (RAID 0) hard drive

Windows 2000 Server SP2

Internet Information Systems (IIS) 5.0

MSMQ

SQL Server 2000

Exchange Server 2000 (if SMTP supported)

A full capability configuration can be built from the following components:

Configuration	Installed Software
Gateway Server Array (1-16 servers) Single-Processor 500 MHz 500 MB RAM 40 GB RAID 0 SCSI disk	Windows 2000 Server SP2 ISA Server – Enterprise Edition Host Integration Server (opt)
Transport Conversion Server Cluster (2-16 servers) Dual-Processor 2 GHz 4 GB RAM 100 GB RAID 5 SCSI array	Windows 2000 Advanced Server SP2 .NET Framework IIS 5.0 MSMQ Exchange Server 2000
Accounting Server (2-4 servers) Dual-Processor 2 GHz 4 GB RAM 100 GB RAID 5 SCSI array	Windows 2000 Advanced Server SQL Server 2000 .NET Framework Commerce Server 2000 (opt)
Core Navigation Server (2-16 servers) Quad-Processor 700 MHz 1 gig RAM 200 GB RAID 5 SCSI array	Windows 2000 with latest service pack IIS 5.0 .NET Framework Host Integration Server (opt)

General Considerations

Host Integration Server can be included if it is necessary to establish client-server connectivity with a mainframe system at the Gateway or for content integration at the Core Navigation server. These options are discussed in more detail in the next chapter.

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