Sun Java Communications Suite 5 Deployment Planning Guide

One-tiered Instant Messaging Architecture

In a one-tiered architecture, there is no separation between access and data layers. The Instant Messaging server, multiplexor, and sometimes the Directory server are installed in one layer. The following figure illustrates the idea.

Figure 20–2 Simplified One-tiered Instant Messaging Architecture

This diagram shows a simplified one-tiered deployment
for Instant Messaging server, a Directory Server, a multiplexor, and end users.

One-tiered architectures have lower up-front hardware costs than two-tiered architectures. However, if you choose a one-tiered architecture, you need to allow for significant maintenance windows.

To size a one-tiered architecture:

  1. Add CPU for SSL, if necessary.

  2. Account for denial of service attacks.

  3. Add more disks for the increased number of client connections.

  4. Add more disks for each multiplexor.

For specific instructions on sizing Instant Messaging components in one-tiered or two-tiered architectures, contact your Sun Client Services representative.