Red Hat GFS 6.0 -, Administrator'S Manual

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Chapter 6. Creating the Cluster Configuration System Files 41
cluster {
name = "alpha"
lock_gulm {
servers = ["n01", "n02", "n03"]
heartbeat_rate = 20
allowed_misses = 3
}
}
Example 6-1.
cluster.ccs
6.6. Creating the
fence.ccs
File
You can configure each node in a GFS cluster for a variety of fencing devices. To configure fencing
for a node, you need to perform the following tasks:
•
Create the
fence.ccs
file — Define the fencing devices available in the cluster (described in this
section).
•
Create the
nodes.ccs
file — Define which fencing method (or methods) each node should use
(refer to Section 6.7 Creating the
nodes.ccs
File ).
Creating the
fence.ccs
file consists of defining each fencing device you are going to use. You can
define the following types of fencing devices in the
fence.ccs
file:
•
APC MasterSwitch
•
WTI NPS (Network Power Switch)
•
Brocade FC (Fibre Channel) switch
•
McData FC switch
•
Vixel FC switch
•
GNBD
•
HP RILOE card
•
xCAT
•
Egenera BladeFrame system
•
Manual
Warning
Manual fencing should not be used in a production environment. Manual fencing depends on
human intervention whenever a node needs recovery. Cluster operation is halted during the inter-
vention.
The
fence.ccs
file is used in conjunction with the
nodes.ccs
file to configure fencing in a cluster.
The
nodes.ccs
file specifies fencing devices that are defined in the
fence.ccs
file. The
fence.ccs
file can define any combination of fencing devices.
If a node has dual power supplies, you must define a fencing device for each power supply. Similarly,
if a node has multiple paths to FC storage, you must define a fencing device for each path to FC
storage.
For more information about fencing, refer to Chapter 10
Using the Fencing System .