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5.3. Moving root File Systems from a Single Path Device to a Multipath Device

If you have installed your system on a single-path device and later add another path to the root file system, you will need to move your root file system to a multipathed device. This section documents the procedure for moving from a single-path to a multipathed device.
After ensuring that you have installed the device-mapper-multipath package, perform the following procedure:
  1. Execute the following command to create the /etc/multipath.conf configuration file, load the multipath module, and set chkconfig for the multipathd to on: 
    # mpathconf --enable
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    For further information on using the mpathconf command to set up multipathing, see Section 3.1, “Setting Up DM Multipath”.
  2. If the find_multipaths configuration parameter is not set to yes, edit the blacklist and blacklist_exceptions sections of the /etc/multipath.conf file, as described in Section 4.2, “Configuration File Blacklist”.
  3. In order for multipath to build a multipath device on top of the root device as soon as it is discovered, enter the following command. This command also ensures that find_multipaths will allow the device, even if it only has one path. 
    # multipath -a root_devname
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    For example, if the root device is /dev/sdb, enter the following command. 
    # multipath -a /dev/sdb
wwid '3600d02300069c9ce09d41c4ac9c53200' added
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  4. To confirm that your configuration file is set up correctly, you can enter the multipath command and search the output for a line of the following format. This indicates that the command failed to create the multipath device. 
    date  wwid: ignoring map
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    For example, if the WWID if the device is 3600d02300069c9ce09d41c4ac9c53200, you would see a line in the output such as the following: 
    # multipath
Oct 21 09:37:19 | 3600d02300069c9ce09d41c4ac9c53200: ignoring map
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  5. To rebuild the initramfs file system with multipath, execute the dracut command with the following options: 
    # dracut --force -H --add multipath
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  6. Shut the machine down.
  7. Configure the FC switch so that other paths are visible to the machine.
  8. Boot the machine.
  9. Check whether the root file system ('/') is on the multipathed device.
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