How to Scan new LUNs on Linux with QLogic driver

Q: I am using QLogic driver and I would like to know how do I scan new LUNs on Linux operating system?

A: 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 user):

# 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 –c