I am looking for the conditions that I need to follow to ensure I can stack multiple instances on one server.
the service levels must be similar
support windows must be the same
should not mix 32 & 64 bit on the same server
ensure that the filesystems used or different (e.g. 2 DB cannot use /data1)
Ensure that the userids have the proper rights (an admin on one DB may not be the admin for another)
Anything else I should be considering?