Scaning FC_LUN's in RedHat linux

# fdisk -l 2> /dev/null | egrep '^Disk' | egrep -v 'dm-' |wc -l

# ls /sys/class/fc_host/
host1  host8

For FC
#  echo "1" > /sys/class/fc_host/host1/issue_lip
#  echo "1" > /sys/class/fc_host/host8/issue_lip

For SCSI

#  echo "1" > /sys/class/scsi_host/host1/scan
#  echo "1" > /sys/class/scsi_host/host8/scan


# fdisk -l 2> /dev/null | egrep '^Disk' | egrep -v 'dm-' |wc -l

Switch port conflict

How to solve switch port conflict for Brocade 

1. Portdisable (ISL ports) 
2. Cfgdisable 
3. Cfgclear 
4. Cfgsave 
5. Defzone –allaccess 
6. Portenable (isl ports)

multipath

multipath –ll
multipathd –k
multipathd> show config
multipathd> show maps