Installation guide

36 Chapter 1. Red Hat Cluster Suite Overview

• Fence Devices — Displays fence devices. Fence devices are represented as subordinate

elements under Fence Devices. Using conﬁguration buttons at the bottom of the right

frame (below Properties), you can add fence devices, delete fence devices, and edit

fence-device properties. Fence devices must be deﬁned before you can conﬁgure fencing

(with the Manage Fencing For This Node button) for each node.

• Managed Resources — Displays failover domains, resources, and services.

• Failover Domains — For conﬁguring one or more subsets of cluster nodes used to

run a high-availability service in the event of a node failure. Failover domains are rep-

resented as subordinate elements under Failover Domains. Using conﬁguration but-

tons at the bottom of the right frame (below Properties), you can create failover do-

mains (when Failover Domains is selected) or edit failover domain properties (when

a failover domain is selected).

• Resources — For conﬁguring shared resources to be used by high-availability ser-

vices. Shared resources consist of ﬁle systems, IP addresses, NFS mounts and ex-

ports, and user-created scripts that are available to any high-availability service in the

cluster. Resources are represented as subordinate elements under Resources. Using

conﬁguration buttons at the bottom of the right frame (below Properties), you can

create resources (when Resources is selected) or edit resource properties (when a

resource is selected).

Note

The Cluster Conﬁguration Tool provides the capability to conﬁgure private re-

sources, also. A private resource is a resource that is conﬁgured for use with only

one service. You can conﬁgure a private resource within a Service component in

the GUI.

• Services — For creating and conﬁguring high-availability services. A service is con-

ﬁgured by assigning resources (shared or private), assigning a failover domain, and

deﬁning a recovery policy for the service. Services are represented as subordinate el-

ements under Services. Using conﬁguration buttons at the bottom of the right frame

(below Properties), you can create services (when Services is selected) or edit service

properties (when a service is selected).

Figure 1-25 shows an example of the hierarchical relationship among cluster nodes, high-

availability services, and resources. The cluster nodes are connected to one or more fencing

devices. Nodes can be grouped into a failover domain for a cluster service. The services

comprise resources such as NFS exports, IP addresses, and shared GFS partitions.