When you are satisfied with your entries, click Forward to continue to the final screen, which prompts you to click Apply and save the changes to the cluster configuration files. A pop up window appears allowing you to write the files or cancel the save and go back and change the settings.
Once you have written the configuration files, you cannot change them again using the GFS Setup Druid. You must either restart the configuration from the beginning or edit each cluster configuration file manually using a text editor such as vi or emacs.
Once the files are saved, you can create the cluster configuration archive (CCA), which is a binary accessible to the cluster via shared device (also called a pool volume).
Create the CCA by running the ccs_tool at a shell prompt as root. The usage of ccs_tool for creating the CCA is as follows:
ccs_tool create /directory CCADevice
For example, if your cluster configuration files are located in /tmp, and you created a shared device named /dev/pool/devel_cca using the GFS Pool Volume Manager (which allows you to configure pools of physical storage into logical volumes accessible to cluster nodes as if they were local storage), run the following command:
ccs_tool create /tmp/ /dev/pool/devel_cca
This chapter briefly explains the process of configuring an existing Red Hat Cluster Manager cluster to leverage Red Hat GFS using the GFS Setup Druid. However, for complete instructions on how to properly install, setup, run, and configure Red Hat GFS, refer to the Red Hat GFS Administrator's Guide.