Auto scan new disk in Linux

 for DEV in `ls /sys/class/scsi_host`; do   echo "- - -" > /sys/class/scsi_host/$DEV/scan; done

 Note:

echo "- - -" > /sys/class/scsi_host/host#/scan

 for DEV in `ls /sys/class/scsi_device`; do   echo 1 > /sys/class/scsi_device/$DEV/device/rescan; done