Red Hat CLUSTER SUITE FOR ENTERPRISE LINUX 4.7 Overview page 20

Chapter 1. Red Hat Cluster Suite Overview
Figure 1.5. Fibre Channel Switch Fencing Example
Specifying a fencing method consists of editing a cluster configuration file to assign a
fencing-method name, the fencing agent, and the fencing device for each node in the cluster.
Note
Other fencing parameters may be necessary depending on the type of cluster
manager (either CMAN or GULM) selected in a cluster.
The way in which a fencing method is specified depends on if a node has either dual power
supplies or multiple paths to storage. If a node has dual power supplies, then the fencing
method for the node must specify at least two fencing devices — one fencing device for each
power supply (refer to
node has multiple paths to Fibre Channel storage, then the fencing method for the node must
specify one fencing device for each path to Fibre Channel storage. For example, if a node has
two paths to Fibre Channel storage, the fencing method should specify two fencing devices —
one for each path to Fibre Channel storage (refer to
10
Figure 1.6, "Fencing a Node with Dual Power Supplies"). Similarly, if a
Figure 1.7, "Fencing a Node with Dual Fibre