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.

A simple 3-node cluster is an entry-level redundant architecture used by production deployments.
An optimal N+2 cluster is the Sybase-recommended production architecture.
Virtualization allows you to manage system infrastructure on virtual machines. Virtualization allows platform components to run in isolation, but side-by-side on the same physical machine (typically a 64-bit processor with virtual symmetric multiprocessing). Virtualization, while supported in Unwired Platform deployments, is beyond scope of this document.

Simple Redundant Cluster
The simple 3-node cluster requires minmal hardware investment. Consequently, the simple cluster is an attractive alternative for smaller environments.
Optimally Redundant Cluster
The optimally redundant cluster is more reliable, multi-node deployment and requires a larger hardware investment because of the number of nodes involved. An optimally redundant cluster is the Sybase-recommended solution for larger user environments.

Parent topic: Fault-Tolerant Production Environments