The normal way to get a SCSI device to be recognized on a Linux system is to reboot the system. However this isn't always desirable. It is possible however to scan the SCSI bus for new (or removed) devices using the following command:
echo “- - -” > /sys/class/scsi_host/host#/scan
The # (hash) should be replaced with the number of the SCSI bus you wish to rescan.
You can then ensure that your device has been added (or removed) by typing the following command:
This will show all the devices that the system knows about. If you do not see your new device (or your old device is still shown) then it may be necessary to reboot the system.
Please refer to the text above