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Linux: How to rescan for new LUNs on a Emulex FC Controller

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Hi,

rescan for new LUNs on a Emulex Fibre Channel Controller:

List all HBAs

 root@debdev # ls -l /sys/class/fc_host
lrwxrwxrwx 1 root root 0 Oct 24 12:22 host10 -> ../
lrwxrwxrwx 1 root root 0 Oct 24 12:22 host11 -> ../
lrwxrwxrwx 1 root root 0 Oct 24 12:22 host7 -> ../.
lrwxrwxrwx 1 root root 0 Oct 24 12:22 host9 -> ../.


Start a rescan for new LUNs on a HBA(means real FC Ports not Adapters)

 root@debdev # echo "1" > /sys/class/fc_host/host10/issue_lip
 root@debdev # echo "- - -" > "/sys/class/scsi_host/host10/scan"

or some python code to rescan all adapters

import os

sSCSIPath="/sys/class/scsi_host"
SCSIHosts=os.listdir(sSCSIPath)

for SCSIHost in SCSIHosts:
	f = open(sSCSIPath+"/"+SCSIHost+"/proc_name")
	sLine=f.readline().strip('\n')
	print(sLine)
	if sLine=="lpfc":
		with open(sSCSIPath+"/"+SCSIHost+"/scan", "w") as f:
			f.write("- - -\n")

Get some fibre channel information
The fabric a HBA is connected to

 root@debdev # cat /sys/class/fc_host/host10/fabric_name
0x100056eb2a367958

The WWNN (World wide node name)

 root@debdev # cat /sys/class/fc_host/host10/node_name
0x20000060ca3badb8

The WWPN (World wide port name)

 root@debdev # cat /sys/class/fc_host/host10/port_name
0x10000060ca3badb8

Port speed

 root@debdev # cat /sys/class/fc_host/host10/speed
8 Gbit

Current Porttype

 root@debdev # cat /sys/class/fc_host/host10/port_type
NPort (fabric via point-to-point)

Port State

 root@debdev # cat /sys/class/fc_host/host10/port_state
Online

You can also use the systool to query the sys filesystem

 root@debdev # systool -c fc_host -v

To list the discovered WWNN and WWPNs use

 root@debdev # systool -c fc_transport -v

Michael

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