If you are talking about Real UNIX (ie. HPUX, SUN, AIX) and not Linux. Start at the top of this post.
I assume you are asking, in referring to an "instance", as an individual separate version of the UNIX OS running on a system.
I believe that you are wanting to have multiple instances on one box.
Here is a good link to read:
https://www.unix.com/showthread.php?s...highlight=cell
You will need to have a bootable disk for each different instance (UNIX OS). You will only be able to boot one at a time.
EDIT HERE::
If you are talking about Linux on an Intel platform. You will need to have separate partitions on your hard drive or you can still have separate disks for each one. Although I don't know how you could dual boot with multiple versions of the SAME Linux version, never having done this myself!
