Installation guide

Power fencing — A fencing method that uses a power controller to power off an inoperable node.

Two types of power fencing are available: external and integrated. External power fencing powers

off a node via a power controller (for example an API or a WTI power controller) that is external to

the node. Integrated power fencing powers off a node via a power controller (for example,IBM

Bladecenters, PAP, DRAC/MC, HP ILO, IPMI, or IBM RSAII) that is integrated with the node.

SCSI3 Persistent Reservation Fencing — A fencing method that uses SCSI3 persistent

reservations to disallow access to shared storage. When fencing a node with this fencing method,

the node's access to storage is revoked by removing its registrations from the shared storage.

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.

For more information about brands and models of fencing hardware that are compatible with Red Hat

Cluster Suite components, refer to the hardware configuration guidelines at

http://www.redhat.com/cluster_suite/hardware/.

Figure 1.3, “ Power Fencing Example” shows an example of power fencing. In the example, the

fencing program in node A causes the power controller to power off node D. Figure 1.4, “ Fibre

Channel Switch 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.

Fig u re 1.3. Po wer Fen cin g Example

⁠Chapt er 1 . Red Hat Clust er Suit e Overview