Particularly under VMware you may just add a new disk to linux without the need to reboot the whole thingy. So after adding the new disk as root on the OS:
echo "- - -" > /sys/class/scsi_host/host#/scan
where host# is the bus address usually 0 example
echo "- - -" > /sys/class/scsi_host/host0/scan
will show you the new disk as unpartioned while you would expect to see a message in the messages log
tail -f /var/log/message
and thats it, you now have a new disk which you can partition and add to LVM or whatever you want with it.