some useful commands around fibre channel

WWN & Co

get the wwn from the adapers

SLES

`# for i in \$(ls -d /sys/class/scsi_host/host*/device/fc_host/host*/port_name); do echo \$i \$(cat \$i);done`

e.g.

```# for i in \$(ls -d /sys/class/scsi_host/host*/device/fc_host/host*/port_name); do echo \$i \$(cat \$i);done
/sys/class/scsi_host/host15/device/fc_host/host15/port_name 0x2100f4e9d455702c
/sys/class/scsi_host/host16/device/fc_host/host16/port_name 0x2100f4e9d455702d
/sys/class/scsi_host/host17/device/fc_host/host17/port_name 0x2100f4e9d45573c8
/sys/class/scsi_host/host18/device/fc_host/host18/port_name 0x2100f4e9d45573c9```

multipathing

multipathd commands

multipathd is not only the the multipath daemon itself, but also a useful command for analysing the SAN:

`# multipathd --help`