Methods to retrieve WWPN and WWNN from FC HBA cards

[Nikolas Lam <nlam87346 library usyd edu au>]

Hi,

I'm trying to find out ways of retrieving HBA identifying information
from for Emulex and Qlogic cards on RHEL4 and RHEL5, preferably without
having to install the vendor-provided drivers (in this case HP's package
of lpfc and qla2xx).

On RHEL4 with 2 single-channel Qlogic HBAs, I've found that the files
in /proc/scsi/qla2xxx/* have everything I need:

[nik host1 ~]$ grep -A 2 'SCSI Device Information:' /proc/scsi/qla2xxx/*
/proc/scsi/qla2xxx/0:SCSI Device Information:
/proc/scsi/qla2xxx/0-scsi-qla0-adapter-node=200000e08b9075e6;
/proc/scsi/qla2xxx/0-scsi-qla0-adapter-port=210000e08b9075e6;
--
/proc/scsi/qla2xxx/1:SCSI Device Information:
/proc/scsi/qla2xxx/1-scsi-qla1-adapter-node=200000e08b91ba01;
/proc/scsi/qla2xxx/1-scsi-qla1-adapter-port=210000e08b91ba01;

This concurs with the output of the adapter_info command that comes with
the HP-supplied fibreutils RPM.

[nik host1 ~]$ sudo adapter_info
/proc/scsi/qla2xxx/1: STATE=READY WWNN=200000e08b91ba01
WWPN=210000e08b91ba01
/proc/scsi/qla2xxx/0: STATE=READY WWNN=200000e08b9075e6
WWPN=210000e08b9075e6


However, on RHEL4 with 2 single-channel Emulex HBAs, there appears to be
a discrepancy between what is in /proc/scsi/lpfc/* and what adapter_info
is telling me:

[nik host2 ~]$ cat /proc/scsi/lpfc/0
lpfc0t00 DID 6f0000 WWPN 50:00:1f:e1:50:02:f1:19 WWNN
50:00:1f:e1:50:02:f1:10
lpfc0t01 DID 6f0100 WWPN 50:00:1f:e1:50:02:f1:1d WWNN
50:00:1f:e1:50:02:f1:10
[nik host2 ~]$ cat /proc/scsi/lpfc/1
lpfc1t00 DID 790000 WWPN 50:00:1f:e1:50:02:f1:1c WWNN
50:00:1f:e1:50:02:f1:10
lpfc1t01 DID 790100 WWPN 50:00:1f:e1:50:02:f1:18 WWNN
50:00:1f:e1:50:02:f1:10

[nik host2 ~]$ sudo adapter_info
/sys/class/scsi_host/0: STATE=LINKUP WWNN=20000000c95e0709
WWPN=10000000c95e0709
/sys/class/scsi_host/1: STATE=LINKUP WWNN=20000000c9561b5b
WWPN=10000000c9561b5b

Firstly why is it that there appear to be 2 ports per lpfc device? There
is only one port per card. 

Secondly, why does is there no apparent match between the WWNs output
from /proc and adapter_info?

Thirdly why are the WWNNs all the same in the /proc output?



RHEL5 kernels seem to do things quite differently. It seems like the
info is quite deep somewhere within /sys/class/fc_host/. What's a
recommended method to retrieve this info on RHEL5? And would the method
be consistent regardless of which vendor's HBA's card is being used?

Thanks in advance,

Nik