wwnn and wwpn in RHEL and Suse Linux

[senthil_kumar_1]

Hi

How to view wwnn and wwpn in RHEL and Suse Linux.

[Steven McCoy]

We are using RHEL5.2 here with device-mapper-multipath installed. We obtain our WWIDs via:

ls -l /dev/disk/by-id/

We then add the ids to /etc/multipath.conf (along with an alias), run 'multipath -v2', and then the new LUN(s) is/are accessible.

Are you using QLogic cards? I would recommend downloading the latest HP QLogic drivers and tools if you are because they offer much more information with a simple command.

Please reply if you'd like further details on our procedure here.

[Steven McCoy]

Here's a link to the QLogic tool we used for quick and verbose information:

http://driverdownloads.qlogic.com/QLogicDriverDownloads_UI/SearchByProduct.aspx?ProductCategory=39&Product=255&Os=26

Scroll down to "Linux Tools" and click on the "Snapshot -- HBA/Target/LUN" link.

HTH

[Ciro Iriarte · Accepted solution]

On 2.4 kernel
QLogic:
/proc/scsi/qla2xxx/?
Emulex:
/proc/scsi/lpf/?

On 2.6 kernel
QLogic or Emulex
/sys/class/fc_host/host?/port_name
/sys/class/fc_host/host?/node_name