I've got some servers running other flavors of Linux (eg. FC2) and I'm wondering if I can install CentOS5 to a new empty partition (eg. on a new drive) while running under the old OS? It seems like the installer OS just needs some hardware sniffing ability and the ability to read the installation media and write to the target media, so in principle one should be able to install from a working system to the new partition and then update one's existing GRUB config. Is this doable or perhaps even commonly done?