An encrypted filesystem will protect against bare-metal attacks against a hard drive. Anyone getting their hands on the drive would have to use brute force to guess the encryption key, a substantial hindrance to getting at your data.
Udev and your Ethernet Interface names in a Virtual World
Have you ever cloned a VM (Virtual Machine) of either Redhat or CentOS and had your Ethernet Interface Name change on you to something other than "eth0" or "eth1" ...
If so even though you change /etc/sysconfig/network-scripts/ifcfg-ethXXXX and its entries to reflect your choice of name, after a reboot you still find your ethernet interface