Like asymmetric configuration, symmetric configuration consists of two fully functional Adaptive Servers running on separate machines, with their own system devices, system databases, user databases, and user logins. However, when failover occurs, either of the Adaptive Servers acts as a primary or secondary companion for the other Adaptive Server.
Before you configure two Adaptive Servers as symmetric companions, you must first configure them for asymmetric companions.
Figure 3-2 describes a symmetric configuration for failover between a financial department machine (FIN1 running Adaptive Server MONEY1) and a human resources machine (HUM1 running Adaptive Server PERSONNEL1):
Figure 3-2: Symmetric configuration in a high availability system
During scheduled maintenance or system failure, either MONEY1 fails over to PERSONNEL1 or PERSONNEL1 fails over to MONEY1. For this configuration, both Disk 1 and Disk 2 are shared disks.
See the configuration chapter for your platform for information about configuring the Adaptive Servers in a symmetric setup.
