I had to do a multi version linux install on an old PC, and it struck me that the distros do not make this as easy as perhaps it could be. These are the problems I had with the process (applying to CentOS 5/6 installs):
1. The boot loader configuration for Linux is pretty involved. The distro you are installing will get it right for the version you are just installing, but preserving other Linux installs on other partitions is not well catered for as you are given a "chainloader" windows like default for them that does not work.
2. The /etc/fstab setup now used UUID for the partition by default. This is fine in itself but when combined with insisting on making mount points for other partitions that you will re-create with later installs renders the earlier install non bootabe.
3. The same applies to the boot command from grub, it looks for a UUID by default although that is not such a problem.
4. When booting from a DVD to the install an image from a partition, it would be really nice if the installer would let you start any iso image not just the specific version you have booted the install disk from (then you could have a "universal boot USB drive/DVD".
5. It would also be really nice to have the ability to select the image you want to install from a disk partition, of across NFS. It must be possible to provide this functionality that would make things easier...
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