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4. The DM-Multipath Configuration File
By default, DM-Multipath provides configuration values for the most common uses of multipathing. In addition, DM-Multipath includes support for the most common storage arrays that support DM-Multipath. The default configuration values and the supported devices can be found in the multipath.conf.defaults file.
You can override the default configuration values for DM-Multipath by editing the /etc/multipath.conf configuration file. If necessary, you can also add a storage array that is not supported by default to the configuration file. This chapter provides information on parsing and modifying the multipath.conf file. It contains sections on the following topics:
• Configuration File Overview [p. 86]
• Configuration File Blacklist [p. 87]
• Configuration File Defaults [p. 89]
• Configuration File Multipath Attributes [p. 93]
• Configuration File Devices [p. 94]
In the multipath configuration file, you need to specify only the sections that you need for your configuration, or that you wish to change from the default values specified in the multipath.conf.defaults file. If there are sections of the file that are not relevant to your environment or for which you do not need to override the default values, you can leave them commented out, as they are in the initial file.
The configuration file allows regular expression description syntax.
An annotated version of the configuration file can be found in /usr/share/doc/multipath-tools/examples/ multipath.conf.annotated.gz.