Step 5: Configuring the zfcp device driver

FCP setups running in NPIV mode detect the LUNs automatically and after setting the device online. No further configuration is necessary.

• NPIV example
  1. To set FCP device 0.0.5400 online, issue the following command:

     # chccwdev --online 0.0.5400
     Setting device 0.0.5400 online
     Done

     The chccwdev command is part of s390-tools. For a description of the command see Device Drivers, Features, and Commands, SC33-8411
     After setting the FCP device online, all LUNs with valid host-connections for the WWPN of the NPIV FCP device are automatically visible as SCSI devices:

     # lsscsi
     [0:0:0:1073758410]disk IBM 2107900 0.33 /dev/sda
     [0:0:0:1073823946]disk IBM 2107900 0.33 /dev/sdb

  2. To find out if the FCP setup is running in NPIV mode, check the port_type attribute of the FCP device, for example:

     # cat /sys/bus/ccw/drivers/zfcp/0.0.5400/host0/fc_host/host0/port_type
     NPIV VPORT

• Non-NPIV example
  1. To set the non-NPIV FCP device 0.0.54ea online, issue the following command:

     # chccwdev --online 0.0.54ea
     Setting device 0.0.54ea online
     Done

  2. To configure a LUN 0x4010403200000000, issue the following command:

     # cd /sys/bus/ccw/drivers/zfcp/0.0.54ea
     # echo 0x4010403200000000 > 0x500507630303c562/unit_add

     If the port and the LUN specify a disk in a storage subsystem you should now see a new SCSI disk:

     # lsscsi
     [0:0:0:0] disk IBM 2107900 .309 /dev/sda
     # lszfcp -D
     0.0.5400/0x500507630303c562/0x4010403200000000 0:0:0:0

     The lszfcp command is part of s390-tools. For a description of the command see Device Drivers, Features, and Commands, SC33-8411