5.3. Disabling multipathing by WWID

Procedure

1. Find WWID of a device:

   # multipathd show paths raw format "%d %w" | grep sdb
   sdb 3600508b4001080520001e00011700000

2. Disable devices in the /etc/multipath.conf configuration file by using the wwid entry.

   The following example shows the lines in the DM Multipath configuration file that disable a device with a WWID of 3600508b4001080520001e00011700000:

   blacklist {
          wwid 3600508b4001080520001e00011700000
   }

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