Found another useful thing on the web. This is the quick guide to rescan and configure newly added LUNS in Linux.
To configure the newly added LUNS on RHEL:
# ls /sys/class/fc_hosthost0 host1 host2 host3 fdisk -l 2>/dev/null | egrep '^Disk' | egrep -v 'dm-' | wc -l echo "1" > /sys/class/fc_host/host0/issue_lip echo "- - -" > /sys/class/scsi_host/host0/scan echo "1" > /sys/class/fc_host/host1/issue_lip echo "- - -" > /sys/class/scsi_host/host1/scan echo "1" > /sys/class/fc_host/host2/issue_lip echo "- - -" > /sys/class/scsi_host/host2/scan echo "1" > /sys/class/fc_host/host3/issue_lip echo "- - -" > /sys/class/scsi_host/host3/scan cat /proc/scsi/scsi | egrep -i 'Host:' | wc -l fdisk -l 2>/dev/null | egrep '^Disk' | egrep -v 'dm-' | wc -l
Alternatively, we can
run the re-scan-scsi script.
To scan new LUNs on Linux operating system which is using QLogic driver
You need to find out driver proc file /proc/scsi/qlaXXX.
For example on my system it is /proc/scsi/qla2300/0
Once file is identified you need to type following command (login as the root):
# echo "scsi-qlascan" > /proc/scsi/qla2300/0 # cat /proc/scsi/qla2300/0
Now use the script rescan-scsi-bus.sh new LUN as a device. Run script as follows:
# ./rescan-scsi-bus.sh -l -w
The output of ls -l /sys/block/*/device should give you an idea about how each device is connected to the system.