SAN LUN Mapping in Redhat

To scan for a newly added lun in RHEL OS:
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echo "- - -" > /sys/class/scsi_host/hostX/scan 

will list the SAN model
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yum install lsscsi.x86_64
lsscsi

ls -l /dev/disk/by-path
cat /sys/class/fc_host/host1/issue_lip
echo "1" > /sys/class/fc_host/host1/issue_lip
echo "1" > /sys/class/fc_host/host2/issue_lip
echo "- - -" > /sys/class/scsi_host/host1/scan
echo "- - -" > /sys/class/scsi_host/host2/scan

multipath -ll

Scan the newly added scan
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rescan-scsi-bus.sh
rescan-scsi-bus.sh -i
rescan-scsi-bus.sh -l -w

List the scanned Harddisk
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fdisk -l|grep Disk
ls -l /dev/disk/by-uuid
ls -l /dev/disk/by-id
systool -c fc_host -v
ls -1 /sys/class/fc_host/

To identify luns already mapped
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sg_map -x

check if the HBAs are detected on your system. Use the following command for that:
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lspci | egrep -i "Fibre|Fibre"

check if the fibre cables are connected to the HBA.
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systool -c fc_host -A "port_state"

systool -c fc_host -v

systool -c fc_host -A "port_name"

show wwid details
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multipath -v2 -d