4.9. Modifying the multipath configuration for specific devices with protocol

Procedure

1. View the specific path protocol by running the following:

   # multipathd show paths format "%d %P"
   dev protocol
   sda scsi:ata
   sdb scsi:fcp
   sdc scsi:fcp

2. Edit the overrides section of the /etc/multipath.conf file, by adding protocol subsections for each multipath type.

   The overrides section can include multiple protocol subsections.

   重要

   The protocol subsection must include a type parameter. The configuration of all paths with a matching type parameter is then updated with the rest of the parameters listed in the protocol subsection.

   • Settings for path devices, which use the scsi:fcp protocol:

     overrides {
             dev_loss_tmo 60
             fast_io_fail_tmo 8
             protocol {
                     type "scsi:fcp"
                     dev_loss_tmo 70
                     fast_io_fail_tmo 10
                     eh_deadline 360
             }
     }

   • Settings for path devices, which use the scsi:iscsi protocol:

     overrides {
             dev_loss_tmo 60
             fast_io_fail_tmo 8
             protocol {
                     type "scsi:iscsi"
                     dev_loss_tmo 60
                     fast_io_fail_tmo 120
             }
     }

   • Settings for path devices, which use all other protocols:

     overrides {
             dev_loss_tmo 60
             fast_io_fail_tmo 8
             protocol {
                     type "<type of protocol>"
                     dev_loss_tmo 60
                     fast_io_fail_tmo 8
             }
     }