Installation guide

Important
Although the Cluster Configuration Tool provides a Quorum Votes parameter in the
Properties dialog box of each cluster member, that parameter is intended only for use during
initial cluster configuration. Furthermore, it is recommended that you retain the default Quorum
Votes value of 1. For more information about using the Cluster Configuration Tool, refer to
Chapter 5, Configuring Red Hat Cluster With system-config-cluster.
Important
If you are changing the number of cluster members, refer to Section 5.5, “Adding and Deleting
Members”. You must take into account certain circumstances for both DLM and GULM clusters
when adding or deleting members.
To edit the cluster configuration file, click the Cluster Configuration tab in the cluster configuration
GUI. Clicking the Cluster Configurat ion tab displays a graphical representation of the cluster
configuration. Change the configuration file according the the following steps:
1. Make changes to cluster elements (for example, create a service).
2. Propagate the updated configuration file throughout the cluster by clicking Send to Cluster.
Note
The Cluster Configurat ion T ool does not display the Send to Cluster button if the
cluster is new and has not been started yet, or if the node from which you are running the
Cluster Configurat ion Tool is not a member of the cluster. If the Send to Cluster
button is not displayed, you can still use the Cluster Configuration Tool; however, you
cannot propagate the configuration. You can still save the configuration file. For information
about using the Cluster Configuration Tool for a new cluster configuration, refer to
Chapter 5, Configuring Red Hat Cluster With system-config-cluster.
3. Clicking Send to Cluster causes a Warning dialog box to be displayed. Click Yes to save
and propagate the configuration.
4. Clicking Yes causes an Information dialog box to be displayed, confirming that the current
configuration has been propagated to the cluster. Click OK.
5. Click the Cluster Management tab and verify that the changes have been propagated to the
cluster members.
6.4. Backing Up and Restoring the Cluster Database
The Cluster Configurat ion T ool automatically retains backup copies of the three most recently used
configuration files (besides the currently used configuration file). Retaining the backup copies is useful if
the cluster does not function correctly because of misconfiguration and you need to return to a previous
working configuration.
Each time you save a configuration file, the Cluster Configurat ion T ool saves backup copies of the
three most recently used configuration files as /etc/cluster/cluster.conf.bak.1,
/etc/cluster/cluster.conf.bak.2, and /etc/cluster/cluster.conf.bak.3. T he backup
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