Red Hat Enterprise Linux 5 Cluster Suite Overview page 14

Chapter 1. Red Hat Cluster Suite Overview
• Power fencing — A fencing method that uses a power controller to power off an inoperable node.
• Fibre Channel switch fencing — A fencing method that disables the Fibre Channel port that
connects storage to an inoperable node.
• GNBD fencing — A fencing method that disables an inoperable node's access to a GNBD server.
• Other fencing — Several other fencing methods that disable I/O or power of an inoperable node,
including IBM Bladecenters, PAP, DRAC/MC, HP ILO, IPMI, IBM RSA II, and others.
Figure 1.3, "Power Fencing Example"
program in node A causes the power controller to power off node D.
Fencing Example"
shows an example of Fibre Channel switch fencing. In the example, the fencing
program in node A causes the Fibre Channel switch to disable the port for node D, disconnecting node
D from storage.
Figure 1.3. Power Fencing Example
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shows an example of power fencing. In the example, the fencing
Figure 1.4, "Fibre Channel Switch