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Appendix A. Using Red Hat GFS with Red Hat Cluster Suite

This appendix provides information about considerations to take when running Red Hat GFS 6.0 with Red Hat Cluster Suite and consists of the following sections:

A.1. Terminology

You may have encountered new terms associated with Red Hat Cluster Suite. The following list provides a brief description of terms used with Red Hat GFS and Red Hat Cluster Suite:

GFS Setup Druid

This application is a Red Hat Cluster GUI for initial configuration of Red Hat GFS. The GUI is launched separately from the Red Hat Cluster GUI, the Cluster Configuration Tool. The GFS Setup Druid uses /etc/cluster.xml as input. If /etc/cluster.xml does not exist, the GFS Setup Druid displays a message and exits.

NoteNote
 

You must run the Cluster Configuration Tool before running the GFS Setup Druid; the Cluster Configuration Tool creates /etc/cluster.xml.

To run the GFS Setup Druid, enter the following at the command line:

# redhat-config-gfscluster
gulm-bridge

This is a fence method available for Red Hat Cluster nodes, if and only if the Red Hat GFS RPM is installed on the node that the Cluster Configuration Tool runs on. The gulm-bridge fence method has been added to Red Hat Cluster Suite specifically for the Red Hat Enterprise Linux 3 Update 3 release. Using this fence method on a Red Hat Cluster Manager member prevents it from being fenced twice.

Red Hat Cluster

Red Hat Cluster Manager is part of the Red Hat Cluster Suite. It provides cluster administration functionality for Red Hat Enterprise Linux 3. Red Hat Cluster Manager contains two major components:

  • Red Hat Cluster Manager — The underlying software (non-GUI) that performs Red Hat Cluster administrations services.

  • Cluster Configuration Tool — This component is the graphical user interface (GUI) for Red Hat Cluster Manager. The GUI provides a configuration interface and a status monitor for members and services in a Red Hat Cluster Manager system. The Cluster Configuration Tool accepts configuration data from a user and writes it to the /etc/cluster.xml file. The Red Hat Cluster Manager reads the configuration data from the /etc/cluster.xml file. Also, the Cluster Configuration Tool wraps several command line calls into the Red Hat Cluster Manager, such as starting and stopping services.