4.8. Modifying multipath settings for specific devices

Procedure

1. Modify the multipaths section for specific multipath device. The following example shows multipath attributes specified in the configuration file for two specific multipath devices:

   • The first device has a WWID of 3600508b4000156d70001200000b0000 and a symbolic name of yellow.
   • The second multipath device in the example has a WWID of 1DEC_321816758474 and a symbolic name of red.

   In this example, the rr_weight attribute is set to priorities.

   multipaths {
          multipath {
                 wwid                  3600508b4000156d70001200000b0000
                 alias                 yellow
                 path_grouping_policy  multibus
                 path_selector         "round-robin 0"
                 failback              manual
                 rr_weight             priorities
                 no_path_retry         5
          }
          multipath {
                 wwid                  1DEC_321816758474
                 alias                 red
                 rr_weight             priorities
           }
   }

2. 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

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

   # service multipathd reload