Fault-Tolerant Production Environments

You can design for fault-tolerance by introducing component redundancy in your environment.

For Unwired Platform installations, Sybase recommends a redundant node and cluster strategy for most production environments. A fault-tolerant system supports:

• Load balancing – uses identical Unwired Platform components on a network to balance the number of requests or tasks among these redundant components in parallel.
• Failover – uses identical Unwired Platform components on a network in order to switch to any of the remaining instances in the event of a component failure.

In an Unwired Platform production environment, system design tends to favor load balancing over failover because of the better efficiency it also yields in rather than just ensuring that the system is more reliable.

• Redundant Cluster Architectures
  Use a redundant architecture to back up Unwired Platform production deployments with multiple secondary resources to create a fault-tolerant environment using clusters on a server or data tier.