Using and Administering

The Configuration Files

By taking a look at the configuration files that come with LoadLeveler, you will find that there are many parameters that you can set. In most cases, you will only have to modify a few of these parameters. In some cases, though, depending upon the LoadLeveler nodes, network connection, and hardware availability, you may need to modify additional parameters. This chapter describes these configuration files and the parameters you can set.

Configuring LoadLeveler involves modifying the configuration files that specify the terms under which LoadLeveler can use machines. There are two types of configuration files:

• Global Configuration File: This file by default is called the LoadL_config file and it contains configuration information common to all nodes in the LoadLeveler cluster.
• Local Configuration File: This file is generally called LoadL_config.local (although it is possible for you to rename it). This file contains specific configuration information for an individual node. The LoadL_config.local file is in the same format as LoadL_config and the information in this file overrides any information specified in LoadL_config. It is an optional file that you use to modify information on a local machine. Its full pathname is specified in the LoadL_config file by using the LOCAL_CONFIG keyword. See Step 11: Specify Where Files and Directories are Located for more information. Customizing the Global and Local Configuration Files describes how to tailor this file to suit your needs.