4.3. Modifying multipath configuration file defaults

Procedure

1. View the /etc/multipath.conf configuration file, which includes a template of configuration defaults:

   #defaults {
   #       polling_interval        10
   #       path_selector           "round-robin 0"
   #       path_grouping_policy    multibus
   #       uid_attribute           ID_SERIAL
   #       prio                    alua
   #       path_checker            readsector0
   #       rr_min_io               100
   #       max_fds                 8192
   #       rr_weight               priorities
   #       failback                immediate
   #       no_path_retry           fail
   #       user_friendly_names     yes
   #}

2. Overwrite the default value for any of the configuration parameters. You can copy the relevant line from this template into the defaults section and uncomment it.

   For example, to overwrite the path_grouping_policy parameter to multibus instead of the default value of failover, copy the appropriate line from the template to the initial defaults section of the configuration file, and uncomment it, as follows:

   defaults {
           user_friendly_names     yes
           path_grouping_policy    multibus
   }

3. Validate the /etc/multipath.conf file after modifying the multipath configuration file by running one of the following commands:

   • To display any configuration errors, run:

     # multipath -t > /dev/null

   • To display the new configuration with the changes added, run:

     # multipath -t

4. Reload the /etc/multipath.conf file and reconfigure the multipathd daemon for changes to take effect:

   # service multipathd reload