/dev/websphere: Elastic scaling with WebSphere eXtreme Scale, a killer feature for Cloud and virtualized environments.: "Hosting applications on platforms such as Amazon EC2, its competitors or on private clouds almost requires elastic scaling. Elastic scaling means that adding or subtracting virtual machines to/from the application farm is handled by the application in a transparent way.
The easiest scenario here is a completely stateless application. Here, adding or removing a machine and then incorporating it to the router will achieve that effect but such applications are rare as a database is usually involved.
Databases are typically not elastic"
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