8-way Systems Enable Enterprise Applications

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Windows NT/2000UNIX

hp-ux

MAC OS

Consolidated

Servers

Multiple

Applications

and

Databases

Tier

Two

Servers

Clients

Tier

One

Clients

transport

Presentation

Data Management

Business Logic

transport

Device Management

ERP Central

Server

Application

and

Database

Windows 95/98

linux

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In the centralized environment, the application presentation component runs on the client

with the application business logic and the database management software running on a

server system, competing for server resources. In a distributed environment with 3-tier

topologies, a database is on the third tier (the database server) and one or more

application servers comprise the second tier. Client systems are the first tier in either

arrangement.

Distributed environments can support several times the number of active users over a

centralized system, depending upon the power of the chosen servers. Clearly, the

distributed environment requires more hardware but the scalability in terms of the number

of users supported or the potential transaction throughput offsets the complexity and the

cost.