25.2. Adding FCP-Attached Logical Units (LUNs)
The following is an example of how to add an FCP LUN.
Note
If running under z/VM, make sure the FCP adapter is attached to the z/VM guest virtual machine. For multipathing in production environments there would be at least two FCP devices on two different physical adapters (CHPIDs). For example:
CP ATTACH FC00 TO *CP ATTACH FCD0 TO *
25.2.1. Dynamically Activating an FCP LUN
Follow these steps to activate a LUN:
- Use the
cio_ignorecommand to remove the FCP adapter from the list of ignored devices and make it visible to Linux:# cio_ignore -r DeviceNumberReplace DeviceNumber with the device number of the FCP adapter. For example: - To bring the FCP adapter device online, use the following command:
# chccwdev -e fc00 - Verify that the required WWPN was found by the automatic port scanning of the zfcp device driver:
# ls -l /sys/bus/ccw/drivers/zfcp/0.0.fc00/ drwxr-xr-x. 3 root root 0 Apr 28 18:19 0x500507630040710b drwxr-xr-x. 3 root root 0 Apr 28 18:19 0x50050763050b073d drwxr-xr-x. 3 root root 0 Apr 28 18:19 0x500507630e060521 drwxr-xr-x. 3 root root 0 Apr 28 18:19 0x500507630e860521 -r--r--r--. 1 root root 4096 Apr 28 18:17 availability -r--r--r--. 1 root root 4096 Apr 28 18:19 card_version -rw-r--r--. 1 root root 4096 Apr 28 18:17 cmb_enable -r--r--r--. 1 root root 4096 Apr 28 18:17 cutype -r--r--r--. 1 root root 4096 Apr 28 18:17 devtype lrwxrwxrwx. 1 root root 0 Apr 28 18:17 driver -> ../../../../bus/ccw/drivers/zfcp -rw-r--r--. 1 root root 4096 Apr 28 18:17 failed -r--r--r--. 1 root root 4096 Apr 28 18:19 hardware_version drwxr-xr-x. 35 root root 0 Apr 28 18:17 host0 -r--r--r--. 1 root root 4096 Apr 28 18:17 in_recovery -r--r--r--. 1 root root 4096 Apr 28 18:19 lic_version -r--r--r--. 1 root root 4096 Apr 28 18:17 modalias -rw-r--r--. 1 root root 4096 Apr 28 18:17 online -r--r--r--. 1 root root 4096 Apr 28 18:19 peer_d_id -r--r--r--. 1 root root 4096 Apr 28 18:19 peer_wwnn -r--r--r--. 1 root root 4096 Apr 28 18:19 peer_wwpn --w-------. 1 root root 4096 Apr 28 18:19 port_remove --w-------. 1 root root 4096 Apr 28 18:19 port_rescan drwxr-xr-x. 2 root root 0 Apr 28 18:19 power -r--r--r--. 1 root root 4096 Apr 28 18:19 status lrwxrwxrwx. 1 root root 0 Apr 28 18:17 subsystem -> ../../../../bus/ccw -rw-r--r--. 1 root root 4096 Apr 28 18:17 uevent
- Activate the FCP LUN by adding it to the port (WWPN) through which you would like to access the LUN:
# echo 0x4020400100000000 > /sys/bus/ccw/drivers/zfcp/0.0.fc00/0x50050763050b073d/unit_add - Find out the assigned SCSI device name:
# lszfcp -DV /sys/devices/css0/0.0.0015/0.0.fc00/0x50050763050b073d/0x4020400100000000 /sys/bus/ccw/drivers/zfcp/0.0.fc00/host0/rport-0:0-21/target0:0:21/0:0:21:1089355792
For more information, refer to the chapter on SCSI-over-Fibre Channel in Linux on System z Device Drivers, Features, and Commands on Red Hat Enterprise Linux 6.
