The DM-Multipath Configuration File

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/usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.defaults file.

You can override the default configuration values for DM-Multipath by editing the /etc/multipath.confconfiguration file. If necessary, you can also add a storage array that is not supported by default to the configuration file.
The following posts will provide information on parsing and modifying the multipath.conf file. It contains sections on the following topics:
Configuration file overview
Configuration file blacklist
Configuration file defaults
Configuration file multipaths
Configuration file devices

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 themultipath.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.