Chapter 11 High Availability Services; Accessing High Availability; About High Availability Systems; Terminology & Concepts - Aruba Networks PowerConnect W Clearpass 100 Software Deployment Manual

The goal of a highly available system is to continue to provide network services even if a hardware failure
occurs.
High Availability Services provides the tools required to achieve this goal. These tools include service
clustering, fault tolerance, database replication, configuration replication, automatic failover and automatic
recovery.
You must have two ClearPass Guest servers with the High Availability Services plugin installed in order to
use these features.
See

"About High Availability Systems"

including a detailed explanation of how it works.
See "Cluster Status"
See "Recovering From a Failure"
cluster.

Accessing High Availability

Use the High Availability command link available from the Administrator start page to access the
clustering and replication features.
Alternatively, use the High Availability navigation menu to jump directly to any of the high availability
features.
About High Availability Systems
Terminology & Concepts
A cluster consists of a primary node and a secondary node, configured so that a failure of either node will
not prevent the cluster as a whole from performing its normal functions.
The primary node is the active server in a cluster. The cluster's network services are always delivered by
the primary node.
The secondary node is the backup server in a cluster. If the primary node fails, the secondary
automatically takes over and continues delivering network service.
Fault tolerance is the ability of a server cluster to continue operating if either the primary or secondary
node experiences a hardware failure.
Failover is the process by which the secondary node assumes control of the cluster once the primary node
has failed.
ClearPass Guest 3.9 | Deployment Guide
in this chapter for an introduction to High Availability Services
in this chapter for an explanation of the cluster status messages.
in this chapter for the procedures to use if you need to recover a failed
Chapter 11
High Availability Services
High Availability Services | 425