Installation guide

Section 1.2:Cluster Features 11
Figure 1–2 Cluster Communication Mechanisms
Figure 1–2, Cluster Communication Mechanisms shows how systems communicate in a cluster
configuration. Note that the terminal server used to access system consoles via serial ports is not
a required cluster component.
• Service failover capability
If a hardware or software failure occurs, the cluster will take the appropriate action to maintain ap-
plication availability and data integrity. For example, if a cluster system completely fails, the other
cluster system will restart its services. Services already running on this system are not disrupted.
When the failed system reboots and is able to write to the quorum partitions, it can rejoin the
cluster and run services. Depending on how the services are configured, the cluster can re-balance
the services across the two cluster systems.