After adding a new Hard disk to the virtual machine, now run the following commands to expand the disk space in the physical volume of the Operating System without rebooting the virtual machine by Re-scanning the SCSI Bus and then adding SCSI Device.
# ls /sys/class/scsi_host/
# echo “- – -” > /sys/class/scsi_host/host0/scan
# echo “- – -” > /sys/class/scsi_host/host1/scan
# echo “- – -” > /sys/class/scsi_host/host2/scan