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Underlying hardware and supporting software?

Cloud - Virtual Servers - Physical servers in data centre - in house - shared server?

Need for scalability

One machine or more

Additional system for loading

Additional system for robustness

Don't always need same parallelism at different levels - one driver for a train of 8 carriages

Load Balancing v Clustering

Operating system ...

Linux, Window, Unix and flavours thereof

Web Servers ...

Apache http, IIS, nginx

Application layer ...

Apache Tomcat, Websphere

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