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1.7. DM-Multipath Setup Overview

DM-Multipath includes compiled-in default settings that are suitable for common multipath configurations. Setting up DM-multipath is often a simple procedure.
The basic procedure for configuring your system with DM-Multipath is as follows:
  1. Install device-mapper-multipath rpm.
  2. Edit the multipath.conf configuration file:
    • comment out the default blacklist
    • change any of the existing defaults as needed
    • save the configuration file
  3. Start the multipath daemons.
  4. Create the multipath device with the multipath command.

Important

Note that migrating the root file system of an existing Red Hat Enterprise Linux installation from single path storage to multipath storage is not supported. You must perform a new installation to move the root file system to a multipath storage device. Therefore you should plan your installation accordingly.
Detailed setup instructions for several example multipath configurations are provided in Chapter 3, Setting Up DM-Multipath.
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