Single-Server Installations

In a single-server installation, one Unwired Server node and a data tier are installed during a single installation procedure, executed on a single host.

A single-server Unwired Platform Runtime system is simpler, less expensive to deploy, and generally easier to maintain. However, it also has significant limitations:

It cannot be scaled by adding or subtracting servers, to adapt to changes in system load or performance requirements.
It cannot take advantage of conventional load-balancing and failover mechanisms to provide a greater level of system availability.
The only way you can increase overall system performance is by upgrading the host system resources (CPU, RAM, and so on).

Note: You cannot upgrade a nonclustered Unwired Platform system to a clustered system. You must redeploy the Unwired Platform system, using cluster installation options on suitable hosts.

Plan carefully when you choose between clustered and nonclustered designs. If you can foresee any future requirement for a clustered system, such as a service level agreement (SLA) that would require scalability, or higher system availability, consider initially deploying a clustered Unwired Platform system.